Ohm's Law and the Measurement of Resistance
|
|
- Scott Lucas
- 6 years ago
- Views:
Transcription
1 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 direct proportion to the current. The constant of proportionality is called the resistance. The mathematical representation of this relation is called Ohm's law and it is written as V = IR (1) where V is the potential difference in volts, I is the current in amperes, and R is the resistance measured in ohms (Ω). Resistance, as the name implies, is a measure of how difficult it is for the electrons to flow through a conductor. If a steady current is flowing through a material with a high resistance, it will require a lot of work (provided by the potential difference) to move the electrons through. If the resistance is small, only a little work will be required to move the electrons through and the voltage will be small. All conductors, for the most part, satisfy Ohm's law. Some materials like semiconductors and superconductors don't follow this law and are said to be non-ohmic. The resistance of a conductor depends on many things. The longer the conductor the more work will be required to move electrons through, and hence a greater resistance. If the conductor has a small cross section, there is less space for the electrons to flow and hence more resistance. Usually, there is also a dependence on the temperature of the substance. And finally, some materials are intrinsically better conductors than others. For example, silver is a better conductor than gold. The measure of a material s ability to conduct electrons is called the conductivity σ. A more common and useful measurement is the resistivity ρ of a material. The resistivity is simply the inverse of the conductivity, ρ = 1/σ (2) A conductor made of a material of resistivity ρ, length l, and uniform cross sectional area A, has a resistance R given by R = ρl/a (3) 1
2 In this experiment you will measure resistance and you will find the resistance of a conductor by measuring the current through the conductor at various voltages. The slope of the graph of voltage versus current will be the resistance. Figure 1. The connections for the voltmeter and ammeter. II. APPARATUS You will need the following items for this experiment: Variable power supply Two digital multimeters (used as a voltmeter and an ammeter) Two unknown resistors Wire for connections Light bulb 2
3 A voltmeter should only be connected in parallel, across the leads of a device as shown in Figure 1. The voltage reading will be the voltage drop in the device. An ammeter is always connected in series into the circuit as shown in Figure 1. The ammeter can be damaged by connecting it in parallel. Schematically, our circuit is the simple loop shown in Figure 2 -- a power supply connected in series to a resistor. (The resistor will be different items, but in each case it is the object that we are studying.): Figure 2. A single loop circuit For the power supply we will use a variable power supply (represented by the symbol for a battery-- two parallel lines of different lengths). This easily allows us to vary the potential difference. Next we will add the two meters. It would be a good idea to begin color coding your circuits. In a short while it will be critical to know which wires are connected to the negative terminal (lower potential) and which are connected to the higher side. Typically we use black wires to indicate the lower potential side of the circuit and red to indicate the higher potential. Connect up the two multimeters, one to read the current through the resistor (notice that the current is the same through all parts of our simple circuit as it is not created or destroyed) and another to read the potential drop across the resistor. Remember that the ammeter (current measuring device) needs to be in series with the compenent you re investigating, that way the current travels through the meter. The voltmeter needs to be in parallel with the component under investigation. 3
4 Figure 3. Measuring both current and voltage III. PROCEDURE A. Unknown Resistors To see Ohm's law at work, you will measure combinations of voltage and current for two unknown resistances and measure the slope of the graphs. 1. Set up the equipment as described above. The power should be off when making connections. 2. The power supply should be set for 0 volts. The multimeter should be on the 2 VDC range. (This means it will read values up to 2V.) The ammeter should be connected for the 50 ma range. 3. Turn on the power. By slowly turning the dial on the power supply, you can adjust the voltage across the resistor. As you do this the current should also change. Make ten measurements of voltage and current. Make sure they are well spaced for a good graph. We will increase the voltage up to a maximum of 5V, in 0.5V increments. As you collect the data, you may find that you need to adjust the settings on your meters, so you do not go off scale. 4. Change the resistance and repeat the above steps. 5. Make a graph of voltage versus current for both sets of data with Excel. Measuring the slope of each line will give you the corresponding resistance. 4
5 B. Resistance Measurements on a Light Bulb Now we will repeat the measurements on a different resistor, a light bulb. Just like the unknown resistors, the light bulb will constrict the amount of current that can flow through the loop. We wish to see if the light bulb follows Ohm s Law. 1. Set up the equipment just as you did in the previous part, but replace the resistor with the small light bulb. The power should be off when making connections. 2. The power supply should be set for 0 volts. The voltimeter should be on 2 VDC. The ammeter should be connected for 500 ma. Turn on the power. By slowly turning the dial on the power supply, you can adjust the voltage across the resistor. As you do this the current should also change. Make ten measurements of voltage and current. Here you will want more data points at the low voltage range. Collect data for 5 points under 0.5V; the rest should be spread out the rest of the voltage range. We will increase the voltage up to a maximum of 5V. As you collect the data, you may find that you need to adjust the settings on your meters, so you do not go off scale. 3. Make a graph of voltage versus current for the data. Also answer the questions that follow Table 2. 5
6 IV. DATA Name: Section: Date: Table 1 Unknown Resistors R =? R =? V (V) I (A) V (V) I (A) Slope = (from graph). Slope = (from graph). R =. R =. Table 2- Light Bulb V (V) I (A) V (V) I (A) 6
7 Does Ohm s Law apply to the light bulb? Does it always apply ( Ohmic ), sometimes apply ( sometimes Ohmic ) or never apply ( non-ohmic )? Explain. (To help guide your eye when studying the graph, you might want to have Excel add a trendline to your plot.) Can you determine the bulb s resistance from the graph, just as you did in the previous experiment with the resistors? If so, what value do you say it is, and are there any limitations on this result? One way you can check the resistance of your bulb is to use the multimeter as a ohmmeter. It has the ability to directly measure the resistance of an object. What does the ohmmeter say the bulb s resistance is? Ω What voltage region does this measured resistance correspond to? 7
8 IV. ADDITIONAL QUESTIONS 1. Explain how your graphs in Part A show that Ohm's law is valid. 2. Imagine that you are investigating the behavior of a component and one of the tests you do is to measure the current as a function of applied potential difference. The graph of this data looks something like the following sketch. Can this component be considered Ohmic? That is, is its resistance constant? voltage current Where is the resistance greater? In the low voltage regime or high voltage regime? Explain your reasoning. 8
9 3. Using the ohmmeter, NOT the powered circuit, measure your resistance. (You will likely have to adjust the sensitivity or range of the ohmmeter in order to get a reading that isn t off scale ) What is the value? Measure the resistance across several body parts (hand to hand, index finger to wrist, etc.). Does the resistance vary? If so, what seems to affect it? For your resistance, what amount of current would go through your body if you came in contact with a 120 V potential difference?: It is known that high currents through your body can cause serious injury or death. Here are a few of the typical consequences of different currents A Can be felt 0.005A Is painful 0.010A Causes spasms 0.015A Causes loss of muscle control 0.070A Probably fatal 9
Module 1, Lesson 2 Introduction to electricity. Student. 45 minutes
Module 1, Lesson 2 Introduction to electricity 45 minutes Student Purpose of this lesson Explanations of fundamental quantities of electrical circuits, including voltage, current and resistance. Use a
More informationRESISTANCE & 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 informationPHYS 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 informationOhm 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 informationCurrent, 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 informationDC 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 informationThese 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 informationResistance 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 informationPhysics 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 informationResistance 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 informationDC 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 informationResistance 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 informationOHM'S LAW AND RESISTANCE NETWORKS OBJECT
17 E7 E7.1 OHM'S LAW AND RESISTANCE NETWORKS OBJECT The objects of this experiment are to determine the voltage-current relationship for a resistor and to verify the series and parallel resistance formulae.
More informationOhm 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 informationGeneral Department PHYSICS LABORATORY APHY 112 EXPERIMENT 2: OHMS LAW. Student s name... Course Semester. Year.Reg.No
General Department PHYSICS LABORATORY APHY 112 EXPERIMENT 2: OHMS LAW Student s name... Course Semester. Year.Reg.No FREDERICK UNIVERSITY 1 EXPERIMENT 3 OHMS LAW Equipment needed Equipment needed Circuits
More informationElectromagnetism Unit- Current Sub-Unit
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
More informationVISUAL PHYSICS ONLINE. Experiment PA41A ELECTRIC CIRCUITS
VISUAL PHYSICS ONLINE Experiment PA41A ELECTRIC CIRCUITS Equipment (see Appendices) 12V DC power supply (battery): multimeter (and/or milliammeter and voltmeter); electrical leads; alligator clips; fixed
More informationElectric 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 informationOHM 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 informationOhm 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 informationExperiment 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 informationExamLearn.ie. Current Electricity
ExamLearn.ie Current Electricity Current Electricity An electric current is a flow of electric charge. If a battery is connected to each end of a conductor, the positive terminal will attract the free
More informationDownloaded 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 informationWave Measurement & Ohm s Law
Wave Measurement & Ohm s Law Marking scheme : Methods & diagrams : 2 Graph plotting : 1 Tables & analysis : 2 Questions & discussion : 3 Performance : 2 Aim: Various types of instruments are used by engineers
More informationPHY 132 LAB : Ohm s Law
PHY 132 LAB : Ohm s Law Introduction: In this lab, we look at the concepts of electrical resistance and resistivity. Text Reference: Wolfson 27:2-3. Special equipment notes: 1. Note the tips on wiring
More informationA 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 informationChapter 1: DC circuit basics
Chapter 1: DC circuit basics Overview Electrical circuit design depends first and foremost on understanding the basic quantities used for describing electricity: Voltage, current, and power. In the simplest
More informationCircuits: Light-Up Creatures Student Advanced version
Circuits: Light-Up Creatures Student Advanced version In this lab you will explore current, voltage and resistance and their relationships as given by the Ohm s law. You will also explore of how resistance
More informationLightbulbs and Dimmer Switches: DC Circuits
Introduction It is truly amazing how much we rely on electricity, and especially on devices operated off of DC current. Your PDA, cell phone, laptop computer and calculator are all examples of DC electronics.
More informationElectric Circuit Experiments
Electric Circuit Experiments 1. Using the resistor on the 5-resistor block, vary the potential difference across it in approximately equal increments for eight different values (i.e. use one to eight D-
More informationResistance 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 informationCK-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 informationI = 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 informationActivity Electrical Circuits Simulation
Activity 1.2.3 Electrical Circuits Simulation Introduction Since the late 1800s, engineers have designed systems to utilize electrical energy due to its ability to be converted, stored, transmitted, and
More informationChapter 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 informationLab 4 Ohm s Law and Resistors
` Lab 4 Ohm s Law and Resistors What You Need To Know: The Physics One of the things that students have a difficult time with when they first learn about circuits is the electronics lingo. The lingo and
More information+ A Supply B. C Load D
17 E7 E7.1 OHM'S LAW AND RESISTANCE NETWORKS OBJECT The objects of this experiment are to determine the voltage-current relationship for a resistor and to verify the series and parallel resistance formulae.
More informationExperiment 3. Ohm s Law. Become familiar with the use of a digital voltmeter and a digital ammeter to measure DC voltage and current.
Experiment 3 Ohm s Law 3.1 Objectives Become familiar with the use of a digital voltmeter and a digital ammeter to measure DC voltage and current. Construct a circuit using resistors, wires and a breadboard
More informationELECTRIC CIRCUIT PROBLEMS 12 AUGUST 2014
ELECTRIC CIRCUIT PROBLEMS 12 AUGUST 2014 In this lesson we: Lesson Description Discuss the application of Ohm s Law Explain the series and parallel connection of resistors Discuss the effect of internal
More informationExperiment 2. Ohm s Law. Become familiar with the use of a digital voltmeter and a digital ammeter to measure DC voltage and current.
Experiment 2 Ohm s Law 2.1 Objectives Become familiar with the use of a digital voltmeter and a digital ammeter to measure DC voltage and current. Construct a circuit using resistors, wires and a breadboard
More informationELECTRIC CURRENT VERY SHORT ANSWER QUESTIONS
ELECTRIC CURRENT VERY SHORT ANSWER QUESTIONS 1. Give the equivalent of V A -1. 2. Ten identical wires, each having a resistance of one ohm, are joined in parallel. What is the equivalent resistance of
More informationVocabulary. 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 informationChapter 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 informationElectric Circuit I Lab Manual Session # 2
Electric Circuit I Lab Manual Session # 2 Name: ----------- Group: -------------- 1 Breadboard and Wiring Objective: The objective of this experiment is to be familiar with breadboard and connection made
More informationCHAPTER 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 informationII. 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 informationLab 3 DC CIRCUITS AND OHM'S LAW
43 Name Date Partners Lab 3 DC CIRCUITS AND OHM'S LAW AMPS + - VOLTS OBJECTIVES To learn to apply the concept of potential difference (voltage) to explain the action of a battery in a circuit. To understand
More informationSyllabus 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 informationPHY132 Summer 2010 Ohm s Law
PHY132 Summer 2010 Ohm s Law Introduction: In this lab, we will examine the concepts of electrical resistance and resistivity. Text Reference Young & Freedman 25.2-3. Special equipment notes: 1. Note the
More information1-1. Kirchoff s Laws A. Construct the circuit shown below. R 1 =1 kω. = 2.7 kω R 3 R 2 5 V
Physics 310 Lab 1: DC Circuits Equipment: Digital Multimeter, 5V Supply, Breadboard, two 1 kω, 2.7 kω, 5.1 kω, 10 kω, two, Decade Resistor Box, potentiometer, 10 kω Thermistor, Multimeter Owner s Manual
More informationLab 1: Basic Lab Equipment and Measurements
Abstract: Lab 1: Basic Lab Equipment and Measurements This lab exercise introduces the basic measurement instruments that will be used throughout the course. These instruments include multimeters, oscilloscopes,
More informationActivity Electrical Circuits Simulation
Activity 1.2.3 Electrical Circuits Simulation Introduction Since the late 1800s, engineers have designed systems to utilize electrical energy due to its ability to be converted, stored, transmitted, and
More informationIntroduction 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 informationElectrical Measurements
Electrical Measurements INTRODUCTION In this section, electrical measurements will be discussed. This will be done by using simple experiments that introduce a DC power supply, a multimeter, and a simplified
More informationChapter 1: DC circuit basics
Chapter 1: DC circuit basics Overview Electrical circuit design depends first and foremost on understanding the basic quantities used for describing electricity: voltage, current, and power. In the simplest
More informationLab 4 OHM S LAW AND KIRCHHOFF S CIRCUIT RULES
57 Name Date Partners Lab 4 OHM S LAW AND KIRCHHOFF S CIRCUIT RULES AMPS - VOLTS OBJECTIVES To learn to apply the concept of potential difference (voltage) to explain the action of a battery in a circuit.
More informationRegents 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 informationDC CIRCUITS AND OHM'S LAW
July 15, 2008 DC Circuits and Ohm s Law 1 Name Date Partners DC CIRCUITS AND OHM'S LAW AMPS - VOLTS OBJECTIVES OVERVIEW To learn to apply the concept of potential difference (voltage) to explain the action
More informationDC 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 informationExperiment 1 Basic Resistive Circuit Parameters
Experiment 1 Basic Resistive Circuit Parameters Report Due In-class on Wed., Mar. 14, 2018 Note: (1) The Prelab section must be completed prior to the lab period. (2) All submitted lab reports should have
More informationPH213 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 informationELECTRIC 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 informationDC Circuits, Ohm's Law and Multimeters Physics 246
DC Circuits, Ohm's Law and Multimeters Physics 246 Theory: In this lab we will learn the use of multimeters, verify Ohm s law, and study series and parallel combinations of resistors and capacitors. For
More information1 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 informationCBSE 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 informationElectricity 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 informationElectricity. 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 informationLab. 1: Simple Linear Circuit Analysis
Lab. 1: Simple Linear Circuit Analysis Philippe Piot (February 9th, 27) 1. Ohm's Law The circuit shown in Figure 1 was built with resistance R=1 and then 1 kω. For these two values of the resistance, the
More informationVoltage Current and Resistance II
Voltage Current and Resistance II Equipment: Capstone with 850 interface, analog DC voltmeter, analog DC ammeter, voltage sensor, RLC circuit board, 8 male to male banana leads 1 Purpose This is a continuation
More informationPre-LAB 5 Assignment
Name: Lab Partners: Date: Pre-LA 5 Assignment Fundamentals of Circuits III: Voltage & Ohm s Law (Due at the beginning of lab) Directions: Read over the Lab Fundamentals of Circuits III: Voltages :w & Ohm
More informationA battery transforms chemical energy into electrical energy. Chemical reactions within the cell create a potential difference between the terminals
D.C Electricity Volta discovered that electricity could be created if dissimilar metals were connected by a conductive solution called an electrolyte. This is a simple electric cell. The Electric Battery
More informationAn 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 informationSeries 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 informationGeneral Lab Notebook instructions (from syllabus)
Physics 310 Lab 1: DC Circuits Equipment: Digital Multimeter, 5V Supply, Breadboard, two 1 k, 2.7 k, 5.1 k, 10 k, two Decade Resistor Box, potentiometer, 10 k Thermistor, Multimeter Owner s Manual General
More information2008 D AI Prove that the current density of a metallic conductor is directly proportional to the drift speed of electrons.
2008 D 1. Prove that the current density of a metallic conductor is directly proportional to the drift speed of electrons. 2. A number of identical cells, n, each of emf E, internal resistance r connected
More informationOhm's Law and DC Circuits
Physics Lab II Ohm s Law Name: Partner: Partner: Partner: Ohm's Law and DC Circuits EQUIPMENT NEEDED: Circuits Experiment Board Two Dcell Batteries Wire leads Multimeter 100, 330, 560, 1k, 10k, 100k, 220k
More informationBasic Circuits. PC1222 Fundamentals of Physics II. 1 Objectives. 2 Equipment List. 3 Theory
PC1222 Fundamentals of Physics II Basic Circuits 1 Objectives Investigate the relationship among three variables (resistance, current and voltage) in direct current circuits. Investigate the behaviours
More informationEE283 Laboratory Exercise 1-Page 1
EE283 Laboratory Exercise # Basic Circuit Concepts Objectives:. To become familiar with the DC Power Supply unit, analog and digital multi-meters, fixed and variable resistors, and the use of solderless
More informationV (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 informationCircuitry II. Name: Date: Section C D F. Mr. Alex Rawson Physics
Name: Date: Section C D F Circuitry II Mr. Alex Rawson Physics 1. Three resistors of 100, 140, and 80 are placed in a series circuit. a. Find the equivalent resistance. (Your answer should be between 0
More informationELE.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 informationLABORATORY Experiment 1
LABORATORY Experiment 1 Resistivity Measurement, Resistors and Ohm s Law 1. Objectives To measure the resistance of conductors, insulators and semiconductor and calculate the resistivity of a copper wire.
More informationDC Electric Circuits: Resistance and Ohm s Law
DC Electric Circuits: Resistance and Ohm s Law Goals and Introduction Our society is very reliant on electric phenomena, perhaps most so on the utilization of electric circuits. For much of our world to
More informationVoltage, 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 informationEpisode 108: Resistance
Episode 108: Resistance The idea of resistance should be familiar (although perhaps not secure) from pre-16 science course, so there is no point pretending that this is an entirely new concept. A better
More informationPeriod 12 Activity Sheet Solutions: Electric Circuits
Period 2 Activity Sheet Solutions: Electric Circuits Activity 2.: How are Voltage, Current, and Resistance Related? a) Data Collection Connect the DC power supply to the thin 30 cm length of nichrome wire.
More informationLab #1: Electrical Measurements I Resistance
Lab #: Electrical Measurements I esistance Goal: Learn to measure basic electrical quantities; study the effect of measurement apparatus on the quantities being measured by investigating the internal resistances
More informationDC Circuits PHYS 501 Homework 2
DC Circuits PHYS 501 Homework 2 NAME: (partner if any: ) In-class Laboratory. Worth 12 points. A "circuit" is a circular (completed) path from the red or "+" side of a voltage source through various "circuit
More informationTO INVESTIGATE THE VARIATION OF CURRENT (I) WITH P.D. (V) FOR (a) A METALLIC CONDUCTOR
FOR (a) A METALLIC CONDUCTOR Low voltage power supply, rheostat, voltmeter, ammeter, length of nichrome wire. 6 A - Nichrome wire 1. Set up the circuit as shown and set the voltage supply at 6 d.c. 2.
More informationFig [5]
1 (a) Fig. 4.1 shows the I-V characteristic of a light-emitting diode (LED). 40 I / 10 3 A 30 20 10 0 1.0 1.5 2.0 V / V Fig. 4.1 (i) In Describe the significant features of the graph in terms of current,
More informationElectric 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 informationANSWERS AND MARK SCHEMES. (a) 3 A / 2 1 = 1.5 A 1. (b) 6 V 1. (c) resistance = V / I 1 = 6 / (b) I = V / R 1 = 3 / 15 1 = 0.
QUESTIONSHEET (a) 3 A / 2 =.5 A (b) 6 V (c) resistance = V / I = 6 /.5 = 4 Ω QUESTIONSHEET 2 TOTAL / 6 (a) 5 Ω + 0 Ω = 5 Ω (b) I = V / R = 3 / 5 = 0.2 A Units are essential in calculations. Sometimes eamination
More informationEGR 101 LABORATORY 1 APPLICATION OF ALGEBRA IN ENGINEERING Wright State University
EGR 101 LABORATORY 1 APPLCATON OF ALGEBRA N ENGNEERNG Wright State University OBJECTVE: The objective of this laboratory is to illustrate applications of algebra (lines and quadratics) in engineering.
More informationPre-Laboratory Assignment
Measurement of Electrical Resistance and Ohm's Law PreLaboratory Assignment Read carefully the entire description of the laboratory and answer the following questions based upon the material contained
More information- Draw diagrams with electric potential on the y-axis in which each step of the diagram corresponds to an element of a circuit.
M: Draw Electric Potential Diagrams Level 7 Prerequisites: Solve Combined Circuits in One-Step Points to: Objectives: - Draw diagrams with electric potential on the y-axis in which each step of the diagram
More informationPre-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 informationFigure 1(a) shows a complicated circuit with five batteries and ten resistors all in a box. The
1 Lab 1a Input and Output Impedance Fig. 1: (a) Complicated circuit. (b) Its Thévenin equivalent Figure 1(a) shows a complicated circuit with five batteries and ten resistors all in a box. The circuit
More informationExercise 2: Current in a Series Resistive Circuit
DC Fundamentals Series Resistive Circuits Exercise 2: Current in a Series Resistive Circuit EXERCISE OBJECTIVE circuit by using a formula. You will verify your results with a multimeter. DISCUSSION Electric
More informationUnit 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 informationELECTRIC 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