Electromagnetism Unit- Current Sub-Unit

Size: px
Start display at page:

Download "Electromagnetism Unit- Current Sub-Unit"

Transcription

1 4.2.1 Electrical Current Definitions current unit: or requires: Example #3 A wire carries a current of 50 amperes. How much charge flows through the wire in 10 seconds? How many electrons pass through the wire in 10 seconds? Equation 100 coulombs of charge pass through point A in 4.0 seconds. What is the rate of current flow through point A? PRACTICE 1) A wire allows 2.5 x electrons to flow through it every 8.0 seconds. What is the current passing through the wire in amperes? Example #2 During a thunderstorm a lightning strike transfers 15.0 coulombs of charge in 10.0 milliseconds. What was the electrical current produced in the strike?. 1 P a g e

2 Review Questions Use electrical current equation to determine current, charge, or time. Determine number of electrons flowing based on current or current based on number of electrons. - What is the amount of electrical current passing through a wire if 35 coulombs of charge flow through it in 5.0 seconds? - If a 2.5 ampere current is flowing through a given point on a wire, how long would it take for 100 coulombs of charge to pass this point? [7A] Electrical Resistance Definitions resistance unit: factors that change resistance resistivity: length cross-sectional area temperature Equation [40s] - How much charge passes through a wire if a current of 10 ampere flows through it for 30 seconds? [300C] Resistance Factors - How many electrons per second are flowing through a point in a wire that has 5.0 amperes of current passing through it? R R [3.125E19] ρ A x electrons pass through a given point every second. What amount of electrical current does this represent? R R [4A] L Temp. To build an ideal conductor with the smallest possible resistance you would select one that is:

3 Determine the resistance of a 1.0 meter long copper wire with a cross-sectional area of 0.01 meter 2. Review Questions Use equation to determine resistance, resistivity, length and/or cross-sectional area. Determine composition of a wire. Explain the relationship between resistance and various factors that impact resistance. - What is the resistance of a copper wire with a cross-sectional area of 2.0 x 10-6 meter 2 and a length of 50 meters? [0.43Ω] Example #2 A piece of wire that has a length of 5.0 x 10 7 meters and a cross-sectional area of meter 2 has a resistance of 31.8 ohms. What is the composition of this wire? - What is the length of an aluminum wire with a resistance of 25 milliohms if it has a cross-sectional area of 4.0 x 10-4 meter 2? [355m] - What is the composition of a wire with a resistance of 8.13 ohms if its crosssectional area is 3 x 10-6 meter 2 and its length is 1000 meters? PRACTICE 1) A 100 meter long wire has a resistance of 10 ohms. a. If it is cut into four equal length pieces, what is the resistance of each piece? - Compared to wire A which has a resistance of 10 ohms, wire B has twice the length and half the cross-sectional area. What is the resistance of wire B? [gold] [40Ω] b. If its cross-sectional area were doubled without changing its original length, what would its new resistance be? 3 P a g e

4 4.2.3A Ohm s Law Circuit Elements Ohm s Law - Factors Voltage results in current flow More voltage = Resistance opposes current flow More resistance = Equation A potential difference of 25.0 volts is supplied to a circuit with 100 ohms of resistance. How much current flows through the circuit? measures: resistance: connect to circuit: measures: resistance: connect to circuit: Proper Use of Meters Example #2 A current of 2.0 amperes flows through a 10 ohm resistance. What voltage must be supplied to this resistance? 2.5 Ω Example #3 5 V A 10 volt battery establishes a current of 5.0 amperes in a circuit. What is the resistance of this circuit?

5 4.2.3B Electrical Power Power Law Moving electrons (current) requires ENERGY How much energy gets used depends on: Strength of push - Rate of flow - Example #3 A 2.0 ampere current passes through a circuit with a 300 ohm resistance. What is the power generated in this circuit? Equations PRACTICE 1) A 200 watt heater is run for 5.0 seconds using a 110 volt potential difference. a. Calculate the amount of heat ENERGY produced by the heater in this time. A 12 volt battery is connected to a circuit which allows 10 amperes of current to flow. What is the power of this circuit? b. Calculate the current passing through the heater. Example #2 A 100 watt light bulb is connected to a 120 volt power supply. What amount of current must pass through the light bulb? c. Calculate heater s electrical resistance. 5 P a g e

6 2) What is the power dissipated by a 550 ohm resistor that is connected to a 10.0 volt source of electrical potential. 3) A toaster with an internal resistance of 11.0 ohms is connected to a 110 volt source of electrical potential (standard outlet). a. Calculate the power used by the toaster. Review Questions Use Ohm s Law and Power Law to perform calculations. Analyze graphs to relate voltage, current, resistance, and/or power. Recognize and sketch simple circuits with switches, batteries, meters, and/or resistances. - How much current will pass through a 30 ohm resistor when it is connected to a 90 volt source of electrical potential? - What is the resistance of a heater that allows 12 amperes of current to flow through it when it is connected to a 120 volt source? [3A] b. How much energy is used by the toaster if it takes one minute to produce a slice of toast? - How much power is generated by a light bulb that draws 0.2 ampere of current when connected to a 6.0 volt battery? [10Ω] [1.2W] c. Energy usage in the home is calculated in kilowatt-hours rather than joules. If 1 joule = 2.78 x 10-7 kw h, what is the energy from (b) in kw h? - How much current is drawn by a 4400 watt motor if it is operated at an electrical potential of 220 volts? [20A] d. If the typical cost for electrical energy in New York State is 14 per kw h, how much does it cost to make a slice of toast? - What is the resistance of a component that generates 300 watts of power while allowing 0.5 ampere of current to pass through it? [1200Ω] e. How many slices of toast can you make for a penny?

7 - Sketch a graph of current vs. voltage for a fixed resistance. o What does the slope of this graph represent? o Sketch a graph of current vs. voltage for an object that does NOT obey Ohm s Law Series Circuits Definition and Rules series circuit a circuit in which two or more elements are connected end-to-end so that a single loop of current is formed equivalent resistance more resistors = more resistance V V I Fixed Resistance I Non-fixed Resistance [direct; slope-=r any non-linear graph] current same current throughout voltage voltages add up - In which cases are the meters connected incorrectly? (A) (C) A A All circuit components and the circuit as a whole must obey Ohm s Law. (B) (D) V V [B, C] R R R R eq P a g e

8 Example #2 2. Draw a series circuit that contains: a 1.0 ohm resistor, a 3.0 ohm resistor, a 12 volt battery, a switch, an ammeter, and a voltmeter that will measure the potential difference of the battery. R 1 50 R R R eq Complete the circuit chart below, then sketch the circuit that it describes. PRACTICE 1. The battery in the circuit below supplies it with a potential difference of 160 volts. a. Determine all unknown quantities in this circuit. b. Add an ammeter to the circuit so that it reads the current passing through resistor R 2. c. Add a voltmeter to the circuit so that it reads 100 volts. R R 2 10 R 3 60 R eq 150 R 2 20 Ω R 1 R 2 R 3 R 1 10 Ω R 3 50 Ω R eq

9 4.2.5 Parallel Circuits Definition and Rules series circuit a circuit in which two or more elements are connected so that each has its own current loop. equivalent resistance more resistors = less resistance current currents add up R 1 30 R 2 30 R 3 30 R eq 60 voltage voltages same for each resistor All circuit components and the circuit as a whole must obey Ohm s Law. Junction Rule The total current flowing into and out of a junction must be the same. Example #2 10A 4.0A R 1 20 R 2 50 R A R eq 10A 10A 2.0A 9 P a g e

10 PRACTICE 1. The battery in the circuit below supplies it with a potential difference of 160 volts. a. Determine all unknown quantities in this circuit. b. Add an ammeter to the circuit so that it reads the current passing through resistor R 1. c. Add a voltmeter to the circuit so that it reads the battery voltage. 3. Sketch a parallel circuit that has a 20 ohm resistor, a 40 ohm resistor, a battery that provides 10 volts of electrical potential, and an ammeter that reads the current passing through the 20 ohm resistor. R 1 R 2 R 3 R eq 2. Use the Junction Rule to determine current X in each diagram. 2 A 8 A 5 A Review Questions 4.2.4/5 Explain the difference between series and parallel circuits. Explain how the Junction Rule works and use it to determine unknown currents. Solve circuits of either type using charts, Ohm s Law, and Power Law. Determine the effect of adding/removing resistors and opening/closing switches on circuits. Compare equivalent resistances of different circuits and/or arrangements of resistors. - A 30 ohm resistor and a 20 ohm resistor are connected in series with a 100 volt battery. The electrical current that would pass through the 20 ohm resistor is (1) 5 A (2) 2 A (3) 7 A - A 30 ohm resistor and a 20 ohm resistor are connected in parallel with a 100 volt battery. The electrical current that would pass through the 20 ohm resistor is (1) 5 A (2) 2 A (3) 7 A [2;1] X X 5 A - A 30 ohm resistor and a 20 ohm resistor are connected in series with a 100 volt battery. The electrical potential that is measured across the 30 ohm resistor in this circuit would be: 10 A 4 A (1) < 100 V (2) 100 V (3) > 100 V 16 A X 7 A - A 30 ohm resistor and a 20 ohm resistor are connected in parallel with a 100 volt battery. The electrical potential that is measured across the 30 ohm resistor in this circuit would be: (1) < 100 V (2) 100 V (3) > 100 V [1;2]

11 - Determine the unknown current and its direction in each diagram. 5A? 3A? 7A 3A 5A 7A 6A? 2A [2A ; 4A ; 2A ] - Determine the equivalent resistance of a. three 90 ohm resistors in series b. three 90 ohm resistors in parallel c. a 10 ohm resistor and 20 ohm resistor in series d. a 10 ohm resistor and 20 ohm resistor in parallel e. 5, 10, and 40 ohm resistors in series f. 20, 30, and 40 ohm resistors in parallel g. 120, 142, and 312 ohm resistors in series h. 311, 416, and 520 ohm resistors in parallel [270Ω; 30Ω; 30Ω; 6.7Ω; 55Ω; 9.2Ω; 574Ω; 132Ω] - Which has the least resistance? (1) four 8 ohm resistors connected in parallel (2) two 8 ohm resistors connected in series (3) a single 8 ohm resistor (4) a pair of 2 ohm resistors connected in series [1] - Two 20 ohm resistors are connected in parallel. If a third 20 ohm resisstor is connected to them in parallel the equivalent resistance of the circuit will (1) increase (2) decrease (3) not change - Two 20 ohm resistors are connected in seriesl. If a third 20 ohm resisstor is connected to them in series the equivalent resistance of the circuit will (2) increase (2) decrease (3) not change [2; 1] 11 P a g e

Regents Physics Mr. Mellon Based on Chapter 22 and 23

Regents Physics Mr. Mellon Based on Chapter 22 and 23 Name Regents Physics Mr. Mellon Based on Chapter 22 and 23 Essential Questions What is current? How is it measured? What are the relationships for Ohm s Law? What device measures current and how is it

More information

South Pasadena A.P. Physics Chapter Electric Current & DC Circuits Date / / Period Electricity Practice Test

South Pasadena A.P. Physics Chapter Electric Current & DC Circuits Date / / Period Electricity Practice Test South Pasadena A.P. Physics Name Chapter 18-19 Electric Current & DC Circuits Date / / Period 1 2 3 4 Electricity Practice Test Electric Current I = Q/t 1. A charge of 30 Coulombs passes through a 24-ohm

More information

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in Page 221»Exercise» Question 1: A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R', then the

More information

1 What is an example of a device that changes chemical energy into electrical energy? (A) battery (B) generator (C) light bulb (D) transformer

1 What is an example of a device that changes chemical energy into electrical energy? (A) battery (B) generator (C) light bulb (D) transformer Assignment 1 Electricity Name: 1 What is an example of a device that changes chemical energy into electrical energy? (A) battery (B) generator (C) light bulb (D) transformer 2 What is the definition for

More information

1 V = IR P = IV R eq. 1 R i. = R i. = R eq. V = Energy Q. I = Q t

1 V = IR P = IV R eq. 1 R i. = R i. = R eq. V = Energy Q. I = Q t Chapters 34 & 35: Electric Circuits NAME: Text: Chapter 34 Chapter 35 Think and Explain: 1-3, 6-8, 10 Think and Explain: 1-10 Think and Solve: 1-6 Think and Solve: 1-4 Vocabulary: Ohm s Law, resistance,

More information

Resistance and Ohm s Law

Resistance and Ohm s Law Resistance and Ohm s Law Textbook pages 290 301 Section 8.3 Summary Before You Read Do you think electrons can move through all conducting substances equally well? Give your reasons why or why not on the

More information

ELECTRIC CIRCUITS PREVIEW QUICK REFERENCE. Important Terms

ELECTRIC CIRCUITS PREVIEW QUICK REFERENCE. Important Terms ELECTRC CRCUTS PREEW Conventional current is the flow of positive charges though a closed circuit. The current through a resistance and the voltage which produces it are related by Ohm s law. Power is

More information

Resistance and Ohm s Law R V I. 1 ohm = 1 volt ampere

Resistance and Ohm s Law R V I. 1 ohm = 1 volt ampere Resistance and Ohm s Law If you maintain an electric potential difference, or voltage V, across any conductor, an electric current occurs. In general, the magnitude of the current depends on the potential

More information

PhysicsAndMathsTutor.com 1

PhysicsAndMathsTutor.com 1 PhysicsAndMathsTutor.com 1 1. A 12 V 36 W lamp is lit to normal brightness using a 12 V car battery of negligible internal resistance. The lamp is switched on for one hour (3600 s). For the time of 1 hour,

More information

PH213 Chapter 26 solutions

PH213 Chapter 26 solutions PH213 Chapter 26 solutions 26.6. IDENTIFY: The potential drop is the same across the resistors in parallel, and the current into the parallel combination is the same as the current through the 45.0-Ω resistor.

More information

Chapters 34: Ohm s Law

Chapters 34: Ohm s Law Text: Chapter 34 Think and Explain: 1-3, 6-8, 10 Think and Solve: 1-6 Chapters 34: Ohm s Law Vocabulary: Ohm s Law, resistance, resistivity, superconductor, current, amps, volts, ohms, kw-h, AC, DC Equations:

More information

CHAPTER 3: ELECTRIC CURRENT AND DIRECT CURRENT CIRCUIT

CHAPTER 3: ELECTRIC CURRENT AND DIRECT CURRENT CIRCUIT CHAPTER 3: ELECTRIC CURRENT AND DIRECT CURRENT CIRCUIT PSPM II 2005/2006 NO. 3 3. (a) Write Kirchhoff s law for the conservation of energy. FIGURE 2 (b) A circuit of two batteries and two resistors is

More information

Downloaded from

Downloaded from Question 1: What does an electric circuit mean? An electric circuit consists of electric devices, switching devices, source of electricity, etc. that are connected by conducting wires. Question 2: Define

More information

Forces and Electrical Charges

Forces and Electrical Charges CHAPTER 7 BLM 3-8 Forces and Electrical Charges Goal Review your knowledge of electric charge and its interaction with conductors, insulators, and electroscopes. Answer the questions that follow. 1. Classify

More information

CBSE TEST PAPER-01 CLASS - X Science (Electricity and its Effects)

CBSE TEST PAPER-01 CLASS - X Science (Electricity and its Effects) CBSE TEST PAPER-01 CLASS - X Science (Electricity and its Effects) 1. Which two circuit components are connected in parallel in the following circuit diagram? - >. < < 2. A metallic conductor has loosely

More information

Electric Current & DC Circuits

Electric Current & DC Circuits Electric Current & DC Circuits PSI AP Physics B Name Multiple-Choice 1. The length of an aluminum wire is quadrupled and the radius is doubled. By which factor does the resistance change? (A) 2 (B) 4 (C)

More information

ELECTRIC Circuits Test

ELECTRIC Circuits Test ELECTRIC Circuits Test Name: /50 Multiple Choice (1 mark each) ( 13 marks) 1. Circle the best answer for each of the multiple choice questions below: Quantity measured Units used 1 -- potential difference

More information

Series and Parallel DC Circuits

Series and Parallel DC Circuits Series and Parallel DC Circuits asic Circuits n electric circuit is closed loop of conductive material (metal wire) that connects several circuit elements together (batteries, resistors, capacitors, etc.)

More information

Chapter 20 Electric Circuits

Chapter 20 Electric Circuits Chapter 20 Electric Circuits 1 20.1 Electromotive Force and Current In an electric circuit, an energy source and an energy consuming device are connected by conducting wires through which electric charges

More information

Electric Circuits. Alternate Units. V volt (V) 1 V = 1 J/C V = E P /q V = W/q. Current I ampere (A) 1 A = 1 C/s V = IR I = Δq/Δt

Electric Circuits. Alternate Units. V volt (V) 1 V = 1 J/C V = E P /q V = W/q. Current I ampere (A) 1 A = 1 C/s V = IR I = Δq/Δt Electric Circuits Quantity Symbol Units Charge Q,q coulomb (C) Alternate Units Formula Electric Potential V volt (V) 1 V = 1 J/C V = E P /q V = W/q Work, energy W, E P joule (J) W = qv E P = qv Current

More information

Electric Circuits Vocabulary

Electric Circuits Vocabulary Electric Circuits Vocabulary Term Electric Current Definition Electric Circuit Open Circuit Conductors Insulators Ohm s Law Current Voltage Resistance Electrical Power Series Circuit Parallel Circuit Page

More information

INTRODUCTION TO CIRCUITS NOTES

INTRODUCTION TO CIRCUITS NOTES INTRODUCTION TO CIRCUITS NOTES WHAT IS A CIRCUIT? For electricity to flow from a battery to light up a light bulb, there must be a complete path from the positive terminal on top of the battery to the

More information

Ohm's Law and the Measurement of Resistance

Ohm's Law and the Measurement of Resistance Ohm's Law and the Measurement of Resistance I. INTRODUCTION An electric current flows through a conductor when a potential difference is placed across its ends. The potential difference is generally in

More information

Resistance and Ohm s law

Resistance and Ohm s law Resistance and Ohm s law Objectives Characterize materials as conductors or insulators based on their electrical properties. State and apply Ohm s law to calculate current, voltage or resistance in an

More information

Name: Period: Date: 2. In the circuit below, n charge carriers pass the point P in a time t. Each charge carrier has charge q.

Name: Period: Date: 2. In the circuit below, n charge carriers pass the point P in a time t. Each charge carrier has charge q. Name: Period: Date: IB-1 Practice Electrical Currents, Resistance, and Circuits Multiple Choice Questions 1. In the circuit below, which meter is not correctly connected? A 1 3 A 2 4 A. 1 B. 2 C. 3 D.

More information

Introduction to Engineering ENGR Electrical Engineering. Dr. Coates

Introduction to Engineering ENGR Electrical Engineering. Dr. Coates Introduction to Engineering ENG 1100 - Electrical Engineering Dr. Coates Branches of Electrical Engineering Circuits/Microelectronics Communications Computer Hardware and Software, Digital Logic, Microprocessor

More information

Vocabulary. Electric Current. Electric Circuit. Open Circuit. Conductors. Insulators. Ohm s Law Current. Voltage. Resistance.

Vocabulary. Electric Current. Electric Circuit. Open Circuit. Conductors. Insulators. Ohm s Law Current. Voltage. Resistance. Vocabulary Term Electric Current Definition Electric Circuit Open Circuit Conductors Insulators Ohm s Law Current Voltage Resistance Electrical Power Series Circuit Parallel Circuit Page 1 Symbols Used

More information

Electricity. AQA Physics topic 2

Electricity. AQA Physics topic 2 Electricity AQA Physics topic 2 Identify circuit components from their symbols. Draw and interpret simple circuit diagrams. Construct a simple electrical circuit. State that resistance restricts the size

More information

I = q/ t units are C/s = A (ampere)

I = q/ t units are C/s = A (ampere) Physics I - Notes Ch. 19-20 Current, Resistance, and Electric Circuits Electromotive force (emf = ε = V; units are volts) charge pump ; source that maintains the potential difference (voltage) in a closed

More information

1. A battery of internal resistance 2 Ω is connected to an external resistance of 10 Ω. The current is 0.5 A.

1. A battery of internal resistance 2 Ω is connected to an external resistance of 10 Ω. The current is 0.5 A. . A battery of internal resistance 2 Ω is connected to an external resistance of 0 Ω. The current is 0.5 What is the emf of the battery?.0 V B. 5.0 V C. 6.0 V D. 24.0 V 2. Two electrodes, separated by

More information

Chapter 20. Circuits. q I = t. (a) (b) (c) Energy Charge

Chapter 20. Circuits. q I = t. (a) (b) (c) Energy Charge Chapter 0 n an electric circuit, an energy source and an energy consuming device are connected by conducting wires through which electric charges move. Circuits Within a battery, a chemical reaction occurs

More information

Section A. Two resistors of 10 Ω and 15 Ω are connected in series to a battery of 6V. How can the values of current passing through them be compared?

Section A. Two resistors of 10 Ω and 15 Ω are connected in series to a battery of 6V. How can the values of current passing through them be compared? EXAM PRACTICE Past Year Board Questions CBSE-Class X Physics Electricity Section A (1 mark each) Question 1. Question 2. Question 3. Question 4. Question 5. Question 6. How is an ammeter connected in a

More information

Electric Current - 1 v Goodman & Zavorotniy

Electric Current - 1 v Goodman & Zavorotniy Chapter Problems Electric Current Classwork 1. If 560 C of electric charge passed through a light bulb in 8 min; what was the magnitude of the average electric current passing through the bulb? 2. If the

More information

Electric Circuits Review

Electric Circuits Review Electric Circuits Review 3.1 Electric Circuits Be able to: o define current o solve problems for current, charge, and time o relate conventional current direction to the electron flow in a conductor o

More information

DC Circuits and Ohm s Law

DC Circuits and Ohm s Law DC Circuits and Ohm s Law INTRODUCTION During the nineteenth century so many advances were made in understanding the electrical nature of matter that it has been called the age of electricity. One such

More information

Ohm s Law and Electrical Circuits

Ohm s Law and Electrical Circuits Ohm s Law and Electrical Circuits INTRODUCTION In this experiment, you will measure the current-voltage characteristics of a resistor and check to see if the resistor satisfies Ohm s law. In the process

More information

RESISTANCE IN WIRES 4) 4R

RESISTANCE IN WIRES 4) 4R RESISTANCE IN WIRES NAME: 1. A copper wire of length L and cross-sectional area A has resistance R. A second copper wire at the same temperature has a length of 2L and a cross-sectional area of 1 2A. What

More information

DC Circuits and Ohm s Law

DC Circuits and Ohm s Law DC Circuits and Ohm s Law INTRODUCTION During the nineteenth century so many advances were made in understanding the electrical nature of matter that it has been called the age of electricity. One such

More information

Electric Circuits Notes 1 Circuits

Electric Circuits Notes 1 Circuits Electric Circuits Notes 1 Circuits In the last chapter we examined how static electric charges interact with one another. These fixed electrical charges are not the same as the electricity that we use

More information

Chapter 21 Electric Current and Direct-Current Circuit

Chapter 21 Electric Current and Direct-Current Circuit Chapter 21 Electric Current and Direct-Current Circuit Outline 21-1 Electric Current 21-2 Resistance and Ohm s Law 21-3 Energy and Power in Electric Circuit 21-4 Resistance in Series and Parallel 21-5

More information

Syllabus OP49 Test electrical conduction in a variety of materials, and classify each material as a conductor or insulator

Syllabus OP49 Test electrical conduction in a variety of materials, and classify each material as a conductor or insulator Physics: 14. Current Electricity Please remember to photocopy 4 pages onto one sheet by going A3 A4 and using back to back on the photocopier Syllabus OP49 Test electrical conduction in a variety of materials,

More information

Current, resistance, and Ohm s law

Current, resistance, and Ohm s law Current, resistance, and Ohm s law Apparatus DC voltage source set of alligator clips 2 pairs of red and black banana clips 3 round bulb 2 bulb sockets 2 battery holders or 1 two-battery holder 2 1.5V

More information

These are samples of learning materials and may not necessarily be exactly the same as those in the actual course. Contents 1.

These are samples of learning materials and may not necessarily be exactly the same as those in the actual course. Contents 1. Contents These are samples of learning materials and may not necessarily be exactly the same as those in the actual course. Contents 1 Introduction 2 Ohm s law relationships 3 The Ohm s law equation 4

More information

Electricity. Intext Exercise 1

Electricity. Intext Exercise 1 Intext Exercise 1 Question 1: What does an electric circuit mean? Solution 1: A continuous and closed path of an electric current is called an electric circuit. electric circuit consists of electric devices

More information

AP Physics 1 Multiple Choice Questions - Chapter 12

AP Physics 1 Multiple Choice Questions - Chapter 12 1 If a current of 125 ma exists in a metal wire, how many electrons flow past a given cross section of the wire in 10 minutes? a 6.25 x 10 21 electrons b 3.98 x 10 19 electrons c 5.35 x 10 22 electrons

More information

PHYSICS ELECTRICITY ASSIGNMENT 1

PHYSICS ELECTRICITY ASSIGNMENT 1 PHYSICS ELECTRICITY ASSIGNMENT 1 1. What does an electric circuit mean? 2. Define the unit of electric current. 3. Calculate the number of electrons in 1 coulomb of charge. 4. Name a device used to maintain

More information

CK-12 Physics Concepts - Intermediate Answer Key

CK-12 Physics Concepts - Intermediate Answer Key Chapter 19: Electrical Circuits 19.1 Series Circuits CK-12 Physics Concepts - Intermediate Answer Key 1. There are three 20.0 Ohm resistors connected in series across a 120 V generator. a. What is the

More information

ELECTRIC CIRCUITS. 1. Which one of the following situations results in a conventional electric current that flows westward?

ELECTRIC CIRCUITS. 1. Which one of the following situations results in a conventional electric current that flows westward? chapter ELECTRIC CIRCUITS www.tutor-homework.com (for tutoring, homework help, or help with online classes) Section 20.1 Electromotive Force and Current Section 20.2 Ohm s Law 1. Which one of the following

More information

DC Circuits. Date: Introduction

DC Circuits. Date: Introduction Group # Date: Names: DC Circuits Introduction In this experiment you will examine how to make simple DC measurements that involve current, voltage, and resistance. The current I through a resistor R with

More information

(a) In the circuit below, lamps P and Q are identical. The reading on the ammeter is 3A. The cell shown is of emf. 6V. A P [2] ...

(a) In the circuit below, lamps P and Q are identical. The reading on the ammeter is 3A. The cell shown is of emf. 6V. A P [2] ... High Demand Questions QUESTIONSHEET 1 (a) In the circuit below, lamps P and Q are identical. The reading on the ammeter is 3A. The cell shown is of emf. 6V. A P Q Calculate the current that passes through

More information

Electricity Transition Questions Applied General in Science

Electricity Transition Questions Applied General in Science Electricity Transition Questions Applied General in Science Marks: 62 marks Pass = 30% Comments: Merit = 45% Distinction = 65% Name: Teacher: MDS Date: Q1. (a) Draw one line from each circuit symbol to

More information

Final Reg Current and Circuits Review SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.

Final Reg Current and Circuits Review SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Final Reg Current and Circuits Review SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 1) How much energy does a 100-W light bulb use in 8.0 hours? 1)

More information

PHYSICS 3204 PUBLIC EXAM QUESTIONS (Electric Circuits)

PHYSICS 3204 PUBLIC EXAM QUESTIONS (Electric Circuits) PHYSICS 3204 PUBLIC EXAM QUESTIONS (Electric Circuits) NAME: August 2009------------------------------------------------------------------------------------------------------------------ 26. What is the

More information

2 Which arrangement of identical resistors would draw the most current when connected to the same potential difference?

2 Which arrangement of identical resistors would draw the most current when connected to the same potential difference? Show all necessary workings for multiple choice. Current Electricity Assignment 2 Name: 1 A circuit consists of a battery and three resistors. The resistors are of unequal value and are connected in parallel.

More information

An electric circuit consists of electric devices, switching devices, source of electricity, etc. that are

An electric circuit consists of electric devices, switching devices, source of electricity, etc. that are Class:X Page 200»Question» What does an electric circuit mean? An electric circuit consists of electric devices, switching devices, source of electricity, etc. that are connected by conducting wires. Define

More information

Voltage, Current and Resistance

Voltage, Current and Resistance Voltage, Current and Resistance Foundations in Engineering WV Curriculum, 2002 Foundations in Engineering Content Standards and Objectives 2436.8.3 Explain the relationship between current, voltage, and

More information

Conceptual Physics. Chapter 23: ELECTRIC CURRENT

Conceptual Physics. Chapter 23: ELECTRIC CURRENT Conceptual Physics Chapter 23: ELECTRIC CURRENT Electric Potential Unit of measurement: volt, 1 volt 1 joule 1 coulomb Example: Twice the charge in same location has twice the electric potential energy

More information

Wallace Hall Academy Physics Department. Electricity. Pupil Notes Name:

Wallace Hall Academy Physics Department. Electricity. Pupil Notes Name: Wallace Hall Academy Physics Department Electricity Pupil Notes Name: 1 Learning intentions for this unit? Be able to state that there are two types of charge; positive and negative Be able to state that

More information

Series and Parallel Circuits Basics 1

Series and Parallel Circuits Basics 1 1 Name: Symbols for diagrams Directions: 1. Log on to your computer 2. Go to the following website: http://phet.colorado.edu/en/simulation/-construction-kit-dc Click the button that says Play with sims

More information

YAL. 12 Electricity. Assignments in Science Class X (Term I) IMPORTANT NOTES

YAL. 12 Electricity. Assignments in Science Class X (Term I) IMPORTANT NOTES Assignments in Science Class X (Term I) 12 Electricity IMPORTANT NOTES 1. There are two kinds of electric charges i.e., positive and negative. The opposite charges attract each other and the similar charges

More information

Unit 3. Electrical Circuits

Unit 3. Electrical Circuits Strand G. Electricity Unit 3. Electrical Circuits Contents Page Representing Direct Current Circuits 2 Rules for Series Circuits 5 Rules for Parallel Circuits 9 Circuit Calculations 14 G.3.1. Representing

More information

Resistance and Ohm s Law

Resistance and Ohm s Law Need to know info: Resistance and Ohm s Law 1. slows down the flow of electrons and transforms electrical energy. 2. is measured in ohms.we calculate resistance by applying a voltage and measuring the

More information

The equation which links current, potential difference and resistance is:

The equation which links current, potential difference and resistance is: Q1.An electrical circuit is shown in the figure below. (a) The current in the circuit is direct current. What is meant by direct current? Tick one box. Current that continuously changes direction. Current

More information

Chapter 13. Electric Circuits

Chapter 13. Electric Circuits Chapter 13 Electric Circuits Lower Potential Battery (EMF - E) - + Higher Potential Bulb (Resistor) Wires (No Change in Potential) EMF (Voltage Source) _ + Resistor Working Circuits For a circuit to work,

More information

Electricity Practice Test 1

Electricity Practice Test 1 Electricity Practice Test 1 Name: ate: 1. This diagram represents a closed circuit with three light bulbs and a 10-volt battery. 3. This diagram represents a circuit with three 20-ohm light bulbs. The

More information

... (1) A battery of emf ε and negligible internal resistance is connected in series to two resistors. The current in the circuit is I.

... (1) A battery of emf ε and negligible internal resistance is connected in series to two resistors. The current in the circuit is I. 1. This question is about electric circuits. (a) Define (i) electromotive force (emf ) of a battery. (ii) electrical resistance of a conductor. (b) A battery of emf ε and negligible internal resistance

More information

Draw, in the space below, a circuit diagram of this circuit. Use the correct symbols for each part of the circuit.

Draw, in the space below, a circuit diagram of this circuit. Use the correct symbols for each part of the circuit. Q1. The drawing shows the circuit used to investigate how the current through a 5 ohm (Ω) resistor changes as the potential difference (voltage) across the resistor changes. (a) Draw, in the space below,

More information

Putting it All Together

Putting it All Together Putting it All Together 1. Vocabulary Review Write the term that correctly completes each statement. Use each term once. ampere electric current resistor battery series connection parallel connection electric

More information

V (in volts) = voltage applied to the circuit, I (in amperes) = current flowing in the circuit, R (in ohms) = resistance of the circuit.

V (in volts) = voltage applied to the circuit, I (in amperes) = current flowing in the circuit, R (in ohms) = resistance of the circuit. OHM S LW OBJECTIES: PRT : 1) Become familiar with the use of ammeters and voltmeters to measure DC voltage and current. 2) Learn to use wires and a breadboard to build circuits from a circuit diagram.

More information

RESISTANCE & OHM S LAW (PART I

RESISTANCE & OHM S LAW (PART I RESISTANCE & OHM S LAW (PART I and II) Objectives: To understand the relationship between potential and current in a resistor and to verify Ohm s Law. To understand the relationship between potential and

More information

The topics in this unit are:

The topics in this unit are: The topics in this unit are: 1 Static electricity 2 Repulsion and attraction 3 Electric circuits 4 Circuit symbols 5 Currents 6 Resistance 7 Thermistors and light dependent resistors 8 Series circuits

More information

Ohm s Law. 1 Object. 2 Apparatus. 3 Theory. To study resistors, Ohm s law, linear behavior, and non-linear behavior.

Ohm s Law. 1 Object. 2 Apparatus. 3 Theory. To study resistors, Ohm s law, linear behavior, and non-linear behavior. Ohm s Law Object To study resistors, Ohm s law, linear behavior, and non-linear behavior. pparatus esistors, power supply, meters, wires, and alligator clips. Theory resistor is a circuit element which

More information

Willis High School Physics Workbook Unit 8 Electricity and Circuits. This workbook belongs to. Mr. Raven's Version

Willis High School Physics Workbook Unit 8 Electricity and Circuits. This workbook belongs to. Mr. Raven's Version Willis High School Physics Workbook Unit 8 Electricity and Circuits This workbook belongs to Period Mr. Raven's Version Electricity and Circuits Pacing Guide DAY DATE TEXTBOOK PREREADING HOMEWORK F 2/1

More information

8) Name three more types of circuits that we will not study in this class.

8) Name three more types of circuits that we will not study in this class. Name Concepts:( power ) 1) What is power? 2) What are the three equations for electrical power? 3) What are two units for power? 4) What does the power company sell its customers? 5) What is the unit sold

More information

charge time Electric Current and Circuits Current HEAT will flow if there is a difference in temperature

charge time Electric Current and Circuits Current HEAT will flow if there is a difference in temperature Electric Current and Circuits Electrons will flow if there is a difference in electric pressure. Electric pressure is called Potential, and is measured in Volts. If there is no difference in pressure from

More information

Chapter 12 Electric Circuits

Chapter 12 Electric Circuits Conceptual Physics/ PEP Name: Date: Chapter 12 Electric Circuits Section Review 12.1 1. List one way electric current is similar to water current and one way it is different. 2. Draw a circuit diagram

More information

PhysicsAndMathsTutor.com 1

PhysicsAndMathsTutor.com 1 PhysicsAndMathsTutor.com 1 1. The figure below shows a circuit containing a battery of e.m.f. 12 V, two resistors, a light-dependent resistor (LDR), an ammeter and a switch S. The battery has negligible

More information

Electric Circuits. Physics 6 th Six Weeks

Electric Circuits. Physics 6 th Six Weeks Electric Circuits Physics 6 th Six Weeks Electric Circuits (a review) A circuit is a path through which electricity can flow Electric Circuits always contain 3 things: a voltage source, a conductor (usually

More information

Ch. 18 and 19 Review Problems 2

Ch. 18 and 19 Review Problems 2 Ch. 18 and 19 Review Problems 2 NAME 1) A device that produces electricity by transforming chemical energy into electrical energy is called a A) generator. B) transformer. C) battery. D) none of the given

More information

8.0 Ω 12.0 Ω. When the switch S is open, show that the potential difference between the points X and Y is 7.2 V.

8.0 Ω 12.0 Ω. When the switch S is open, show that the potential difference between the points X and Y is 7.2 V. 1. The figure below shows a circuit containing a battery of e.m.f. 12 V, two resistors, a light-dependent resistor (LDR), an ammeter and a switch S. The battery has negligible internal resistance. 8.0

More information

PHYS 1402 General Physics II Experiment 5: Ohm s Law

PHYS 1402 General Physics II Experiment 5: Ohm s Law PHYS 1402 General Physics II Experiment 5: Ohm s Law Student Name Objective: To investigate the relationship between current and resistance for ordinary conductors known as ohmic conductors. Theory: For

More information

Exam 2. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.

Exam 2. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question. Name: Class: Date: Exam 2 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. For this circuit, which of these equations is correct? a. 80-1I 2-20I 2-30I 1

More information

Chapters 35: Electric Circuits

Chapters 35: Electric Circuits Text: Chapter 35 Think and Explain: 1-10 Think and Solve: 1-4 Chapters 35: Electric Circuits NME: Vocabulary: ammeter, voltmeter, series, parallel, equivalent resistance, circuit, short circuit, open circuit

More information

ELE.B: Original Assignment Resistors in Series Classwork Homework

ELE.B: Original Assignment Resistors in Series Classwork Homework ELE.B: Original Assignment Resistors in Series Classwork 1. A 3 Ω resistor is connected in series to a 6 Ω resistor and a 12-V battery. What is the current in each of the resistors? What is the voltage

More information

II. Experimental Procedure

II. Experimental Procedure Ph 122 July 27, 2006 Ohm's Law http://www.physics.sfsu.edu/~manuals/ph122/ I. Theory In this lab we will make detailed measurements on one resistor to see if it obeys Ohm's law. We will also verify the

More information

Pre-Lab for Batteries and Bulbs

Pre-Lab for Batteries and Bulbs Pre-Lab for Batteries and Bulbs Complex circuits composed of resistors can be simplified by using the concept of equivalent resistors. For example if resistors R 1, R 2, and R 3 are connected in series,

More information

CURRENT ELECTRICITY. 1. The S.I. unit of power is (a) Henry (b) coulomb (c) watt (d) watt-hour Ans: c

CURRENT ELECTRICITY. 1. The S.I. unit of power is (a) Henry (b) coulomb (c) watt (d) watt-hour Ans: c CURRENT ELECTRICITY 1. The S.I. unit of power is (a) Henry (b) coulomb (c) watt (d) watt-hour 2. Electric pressure is also called (a) resistance (b) power (c) voltage (d) energy 3. The substances which

More information

1. A battery of internal resistance 2 Ω is connected to an external resistance of 10 Ω. The current is 0.5 A. D. 24.

1. A battery of internal resistance 2 Ω is connected to an external resistance of 10 Ω. The current is 0.5 A. D. 24. 1. A battery of internal resistance 2 Ω is connected to an external resistance of 10 Ω. The current is 0.5 A. What is the emf of the battery? A. 1.0 V B. 5.0 V C. 6.0 V D. 24.0 V (Total 1 mark) IB Questionbank

More information

Book page Syllabus 2.8, 2.9, Series and parallel circuits

Book page Syllabus 2.8, 2.9, Series and parallel circuits Book page 77 79 Syllabus 2.8, 2.9, 2.14 Series and parallel circuits Find the Fib! (1) The symbol for a bulb is (2) In a parallel circuit potential difference is the same as the supply voltage on all branches.

More information

3. The current through a given section is steady at 30 pa. How long does a charge of 12 μc take to cross the section? (111 hours)

3. The current through a given section is steady at 30 pa. How long does a charge of 12 μc take to cross the section? (111 hours) UNIVERSITY OF TECHNOLOGY ELECROMECHNICAL DEPARTMANT SYSTEMS BRANCH Dr. Sameir Abd Alkhalik Aziez FIRST YEAR ELECTROMECHNICAL ENGINEERING BASICS ELECRICAL ENGINEERING Question Sheet (1) 1.Give the dimensions

More information

OHM S LAW. Ohm s Law The relationship between potential difference (V) across a resistor of resistance (R) and the current (I) passing through it is

OHM S LAW. Ohm s Law The relationship between potential difference (V) across a resistor of resistance (R) and the current (I) passing through it is OHM S LAW Objectives: a. To find the unknown resistance of an ohmic resistor b. To investigate the series and parallel combination of resistors c. To investigate the non-ohmic resistors Apparatus Required:

More information

Chapter 23 Circuits. Chapter Goal: To understand the fundamental physical principles that govern electric circuits. Slide 23-1

Chapter 23 Circuits. Chapter Goal: To understand the fundamental physical principles that govern electric circuits. Slide 23-1 Chapter 23 Circuits Chapter Goal: To understand the fundamental physical principles that govern electric circuits. Slide 23-1 Chapter 23 Preview Looking Ahead: Analyzing Circuits Practical circuits consist

More information

Physics Circuits. Day 1. QQ5. A charge of 45 C passes through a 12-ohm resistor in 5 seconds. What is the current?

Physics Circuits. Day 1. QQ5. A charge of 45 C passes through a 12-ohm resistor in 5 seconds. What is the current? Homework Procedure: Read pages specified in Honors Physics Essentials by Dan Fullerton. Questions labeled TQ will be questions about the text you read. These TQ s can be answered in one word, one phrase,

More information

Section 4. Ohm s Law: Putting up a Resistance. What Do You See? What Do You Think? Investigate

Section 4. Ohm s Law: Putting up a Resistance. What Do You See? What Do You Think? Investigate Section 4 Ohm s Law: Putting up a Resistance Florida Next Generation Sunshine State Standards: Additional Benchmarks met in Section 4 SC.912.N.2.4 Explain that scientific knowledge is both durable and

More information

Physics 1051 Laboratory #4 DC Circuits and Ohm s Law. DC Circuits and Ohm s Law

Physics 1051 Laboratory #4 DC Circuits and Ohm s Law. DC Circuits and Ohm s Law DC Circuits and Ohm s Law Contents Part I: Objective Part II: Introduction Part III: Apparatus and Setup Part IV: Measurements Part V: Analysis Part VI: Summary and Conclusions Part I: Objective In this

More information

Unit 3.C Electrical Theory, Circuits Essential Fundamentals of Electrical Theory, Circuits

Unit 3.C Electrical Theory, Circuits Essential Fundamentals of Electrical Theory, Circuits Unit 3.C Electrical Theory, Circuits Essential Fundamentals of Electrical Theory, Circuits Early Booklet E.C.: + 1 Unit 3.C Hwk. Pts.: / 36 Unit 3.C Lab Pts.: / 50 Late, Incomplete, No Work, No Units Fees?

More information

Experiment 2 Electric Circuit Fundamentals

Experiment 2 Electric Circuit Fundamentals Experiment 2 Electric Circuit Fundamentals Introduction This experiment has two parts. Each part will have to be carried out using the Multisim Electronics Workbench software. The experiment will then

More information

Closed circuit complete path for electrons follow. Open circuit no charge flow and no current.

Closed circuit complete path for electrons follow. Open circuit no charge flow and no current. Section 1 Schematic Diagrams and Circuits Electric Circuits, continued Closed circuit complete path for electrons follow. Open circuit no charge flow and no current. short circuit closed circuit, no load.

More information

GCSE Physics. The PiXL Club Ltd, Company number

GCSE Physics.   The PiXL Club Ltd, Company number he PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club he PiXL

More information

D W. (Total 1 mark)

D W. (Total 1 mark) 1. One electronvolt is equal to A. 1.6 10 19 C. B. 1.6 10 19 J. C. 1.6 10 19 V. D. 1.6 10 19 W. 2. A battery of internal resistance 2 Ω is connected to an external resistance of 10 Ω. The current is 0.5

More information