DATE: NAME: CLASS: Drawing Circuit Diagrams
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1 CHAPTER 8 BLM 315 Drawing Circuit Diagrams Goal Practise drawing circuit diagrams. For each of the following circuit illustrations, draw its corresponding circuit diagram and answer the questions that follow. 1. Circuit A 2. Circuit B 3. Circuit C 1. Circuit diagram 2. Circuit diagram 3. Circuit diagram n i/ MM m 1. (a) s this circuit open or 2. (a) s this circuit open or 3. (a) s this circuit open or closed? closed closed? open closed? closed (b) f this is a closed circuit, (b) f this is a closed (b) f this is a closed what is the source of the circuit, what is the circuit, what is the potential difference? source of the potential source of the potential battery What is the difference? battery difference? battery load? bulb light What is the load? What is the load? light bulb bulb light
2 2.5A DATE: NAME: CLASS: CHAPTER 8 BLM 317 Calculate the Current Goal Practise calculating current. Calculate the current in each of the following circuit diagrams. The current at the source is represented by s : A 15A 9.0A COA 3.5A A { 3 6.0A 5 2.0A
3 X DATE: NAME: CLASS: CHAPTER 8 Calculate the Potential BLM 318 Difference Goal Practise potential difference calculations. Calculate the missing potential difference in each of the following circuit diagrams. The voltage at the source is represented by Vs [V s ] Diagrams 1. V 1 35V V S HOV V 1 9. OV
4 CHAPTER 8 BLM 321 Ohm s Law Goal Review your understanding of how to use Ohm s law. Answer the following questions. R v 1. What is the resistance of a toaster if a current of 12.5 A flows through it when it is connected to 120 V? R V 120 V 12.5A 9.6k 2. A light bulb has a resistance of 90 Ω. What current flows through the bulb when it is connected to 120 V? V R A 3. A current of 0.50 A flows through a light bulb that has a resistance of 18 Ω. What is the voltage across this light bulb? V Rx 18h x 0.5A 9V 4. A flashlight bulb has a resistance of 4.0 Ω. What current passes through the bulb if it is connected to 3.0 V? R Or 0,75A 5. What potential difference is necessary to produce a current of 0.60 A in a load that has a resistance of 25 Ω? V Rx 25k X 0.60A The current through a load in a circuit is 2.5 A. f the potential difference across the load is 75 V, what is the resistance of the load? R 75V 2.5A 30k 7. (a) An 80 V potential difference is measured across a light bulb that has a resistance of 16 Ω. What is the current through this light bulb? R 8O 16h 5A (b) f the light bulb was replaced by a bulb with twice the resistance, what would be the new current through the bulb? R 80V A 0 8. A 25 ma current flows through a 300 Ω lamp. What is the voltage across the lamp? V RX zoor 0.025A %5V +0,025A
5 CHAPTER 8 BLM 322 Resistor Colour Code Goal Practise using the resistor colour code. Use the resistor colour code table to answer the following questions. Colour black brown red orange yellow green blue violet grey white Numeric value Give the value of each resistor indicated by the colour bands. 1 st band colour 2 nd band colour (a) blue green red 3 rd band colour ndicate the # of zero digits Resistor Value (Ω) 6500 (b) violet black yellow (c) green blue brown (d) brown red black (e) grey violet orange (f) red brown red A current of 0.20 A flows through a resistor when connected to a 46 V power supply. (a) What is the value of this resistor? R V 46V 0.20A 230N (b) What are the first three bands of colour on this resistor? Red Orange Brown 3. A current of 2.5 ma flows through a resistor when connected to a 16 V power supply. (a) What is the value of this resistor? RV 16V (b) What 0,0025A are the first three bands of colour on this resistor? Blue Yellow Red W 6400 R
6 CHAPTER 8 Practising Calculating BLM 323 Resistance Goal Practise calculating resistance. Read the section Ohm s Law on pages of BC Science 9. Use the model questions to help you calculate answers to the following questions. Show all your work. 1. Only A of current pass through a portable CD player. f the CD player is operated by a 9.0 V battery, what is the resistance within the circuit? 2. An automobile headlight has an average resistance of 24 Ω. Car batteries provide a potential difference of 12 V. What amount of current passes through the headlight? R V v R 9. Or R ( A ) R V A 3. n a portable radio, 0.50 A of current are flowing through a conductor that provides 18 Ω of resistance. What potential difference is provided by the battery? 4. A clothes dryer uses a 220 V power source. The coils of the heater provide an average resistance of 12 Ω. What amount of current is flowing through the heating coils? V Rx R 18h 0,50A h q 18,3A
7 BLM 323 continued 5. A 9.0 V battery maintains a current of 3.0 A through a portable radio. What is the resistance of the conductor? 6. What is the resistance of a hair dryer plugged into a 110 V outlet with a 10 A current flowing through it? R V R V R 9. Or 3.0A R 110 V 10A R 3. or R 11h 7. A light bulb will allow 0.50 A to flow through it. f the outlet provides a potential difference of 110 V, how much resistance is provided by the bulb? 8. An automobile headlight has a resistance of 40 Ω when attached to a standard 12 V battery. How much current flows through the headlight? R v R R 110 0,5A 12 40k R ,3A 9. A portable CD player, operating with four 1.5 V batteries connected in series, provides a resistance of Ω. What amount of current is flowing through the CD player? 10. An electric motor has an operating resistance of 25 Ω when a 4.8 A current is flowing through it. What is the potential difference of the outlet the motor is plugged into? V R V Rx 1. 5V 15000k 251 x 48A 0, 0001 A 120 Copyright 2007 McGrawHill Ryerson Limited, a subsidiary of the McGrawHill Companies. All rights reserved.
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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.
... (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
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