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Name: ________________________ Class: ___________________ Date: __________ ID: A Electricity Test ____ ____ ____ 1. In an electrical circuit, a voltage source: a. supplies a potential difference. b. causes a short circuit. c. is the term used for rate of charge flow. d. wastes energy. 2. Electric current will pass easily through a(n): a. absorber. b. conductor. c. semiconductor. d. insulator. 3. In the circuit below, 3 amps of current passes through the light bulb. The resistance of the light bulb is 3 ohms: What is the voltage of the battery? ____ ____ ____ a. 1 volt b. 1 ohm c. 9 volts d. 9 amps 4. As Jing toasts her morning waffle in the family toaster, 4.0 amps of current flows with a voltage of 120 volts across the toaster. The resistance of the toaster is: a. 30 watts. b. 30 ohms. c. 480 watts. d. 0.033 ohms. 5. A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 240 ohms, how much current does it use? a. 2 amps b. 2 volts c. 0.5 amps d. 60 volts 6. What happens to the current in a circuit with fixed voltage if you increase the resistance of the circuit? a. The current increases. b. The current decreases. c. The current stays the same. d. The voltage increases. 1 Name: ________________________ ____ ____ ____ ____ ____ ____ ____ ____ ID: A 7. A closed circuit: a. is off. b. is on. c. has a break in it. d. requires no voltage. 8. All of the following devices are used to create an open circuit EXCEPT a: a. fuse. b. battery. c. switch. d. circuit breaker. 9. In an electrical circuit, the term current refers to: a. resistance. b. potential difference. c. flowing charges. d. energy loss. 10. Materials through which current will not easily flow are called: a. conductors. b. semiconductors. c. insulators. d. absorbers. 11. The mathematical relationship between current, voltage, and resistance is known as ____ law. a. Kirchoff’s b. Faraday c. Ohm’s d. Murphy’s 12. A light bulb requires 2 amps to produce light. The resistance of the bulb is 3 ohms. How many batteries do you need if each battery is 1.5 volts? a. 6 b. 4 c. 1.5 d. 5 13. A 120-volt household circuit has a circuit breaker that opens the circuit if it draws more than 12 amps of current. What is the minimum amount of resistance in the circuit required to keep the circuit breaker from activating? a. 0.1 ohms b. 132 ohms c. 1,440 ohms d. 10 ohms 14. If there is a break at any point in a series circuit, the current will: a. stop everywhere in the circuit. b. leak out of the break point. c. be decreased by one-half. d. continue through remaining unbroken circuit branches. 2 Name: ________________________ ID: A ____ 15. Suppose you connect more and more light bulbs in series to a battery. What happens to the brightness of each bulb as you add more bulbs? a. The bulbs grow brighter with each new bulb added. b. The bulbs grow dimmer with each new bulb added. c. There is no change in brightness. d. The brightness may increase or decrease depending on the type of light bulb. ____ 16. A battery connected to a light bulb with a resistance of 5 ohms causes a current of 2 amperes to flow through the bulb pictured in the diagram below: ____ 17. ____ 18. ____ 19. ____ 20. The voltage across the light bulb is ____ volt(s). a. 0.4 b. 1 c. 2.5 d. 10 When a new branch containing a resistor is added to a parallel circuit, the total circuit resistance: a. decreases. b. increases. c. stays the same. d. may increase or decrease, depending on the device. The wiring in your home uses ____ circuits. a. parallel b. series c. two-way d. three-way A student connects three 1-ohm light bulbs to a 9-volt battery in parallel. The total circuit current is ____ ampere(s). a. 1 b. 3 c. 9 d. 27 Which of the following devices draws the most current when operating on a 120-volt circuit? a. 10-watt clock radio b. 40-watt light bulb c. 50-watt fan d. Each item above draws the same current. 3 Name: ________________________ ID: A The diagram below pictures three identical light bulbs, each with a resistance of 1 ohm, which are connected by resistance-free wires. A 9-volt battery supplies energy to the circuit. Figure 14-1A ____ 21. What type of circuit is the circuit in Figure 14-1A? a. Series b. Parallel c. Compound d. Current ____ 22. The total resistance for the circuit shown in Figure 14-1A is: a. 1 ohm. b. 1 volt. c. 3 ohms. d. 3 volts. ____ 23. The negatively charged particle in an atom is a(n): a. electron. b. proton. c. neutron. d. neutrino. ____ 24. An object with equal amounts of positive and negative charge is called: a. positively charged. b. negatively charged. c. neutral. d. electrically charged. ____ 25. Positive electric charges: a. attract both positive charges and negative charges. b. repel both positive charges and negative charges. c. attract positive charges and repel negative charges. d. repel positive charges and attract negative charges. 4 Name: ________________________ ID: A In the circuit shown below, three identical flashlight bulbs are screwed into sockets and are lighted when the circuit is closed: Figure 14-3A ____ 26. If you unscrewed bulb A in Figure 14-3A: a. only bulb B would go out. b. only bulb C would go out. c. bulbs B and C would go out. d. bulbs B and C would remain lit. ____ 27. The charge of a proton and the charge of an electron have: a. different amount of charge and opposite sign. b. the same amount of charge and opposite sign. c. different amount of charge and the same sign. d. the same amount of charge and the same sign. ____ 28. As the distance between two positively charged objects increases, the force between them: a. increases. b. decreases. c. cannot be determined. d. remains the same. ____ 29. The electrons in an insulator are best described as: a. free to move. b. fixed in place. c. flowing charges. d. a potential difference. ____ 30. Determine the electric force exerted on sphere A. a. 9 109 newtons b. 1.3 1011 newtons c. 1.4 1010 newtons d. 1.6 109 newtons 5 Name: ________________________ ID: A ____ 31. The electric force between a 5-coulomb charge and a 1-coulomb charge 9,000 meters apart is: a. 5,000,000 newtons. b. 666 newtons. c. 556 newtons. d. 0.000556 newtons. ____ 32. The electric field around two positive charges looks most like: a. c. b. d. ____ 33. Which of the following best shows the electric field around a negative charge? a. c. b. d. ____ 34. Calculate the magnitude of the electric field when a 5 Coulomb charge is experiencing an electric force of 6000 Newtons. a. .00083 N/C c. 1200 N/C b. 30000 N/C d. 1.08x10^9 N/C 6 ID: A Electricity Test Answer Section MULTIPLE CHOICE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 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ID: A B 15. _____ A _____ 1. B _____ 8. D 16. _____ B _____ 2. C _____ 9. D 26. _____ C _____ 3. A 21. _____ C 10. _____ B 27. _____ C 22. _____ C 11. _____ A 17. _____ B 28. _____ A 23. _____ B 12. _____ A 18. _____ B 29. _____ B _____ 4. C 24. _____ D 13. _____ D 19. _____ D 30. _____ D 25. _____ C _____ 5. A 14. _____ B _____ 6. C 20. _____ Electricity Test [Answer Strip] C 31. _____ A 32. _____ B 33. _____ C 34. _____ ID: A