p101chap13pretest

p101chap13pretest - Chapter 13: Electric Circuits 1. A...

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Chapter 13: Electric Circuits 1. A household circuit rated at 120 Volts is protected by a fuse rated at 15 amps. What is the maximum number of 100 watt light bulbs which can be lit simultaneously in parallel in this circuit without blowing the fuse? A. 4 B. 8 C. 18 D. 20 E. 24 Answer: C 2. The current (measured in Amperes) in a circuit is A. the amount of charge (measured in Coulombs) that passes a point (in the circuit) in 1 second. B. the amount of the total energy carried by 1 Coulomb of charge. C. the total number of electrons in the circuit. D. never lethal if the current is due to positive charges. Answer: A 3. The resistance of a circuit element is a measure of A. the total energy of the charges in the circuit element. B. the amount of work that an electron can perform. C. the ratio of the voltage difference between element ends to the current in the element. D. the size of the circuit. Answer: C 4. A certain kind of light bulb carries 1.5 amperes of current when connected to a 120 Volt AC circuit. What is its power rating? A. 240 W B. 180 W C. 80 W D. 100 W Answer: B 5. The resistance of a 25 watt bulb is ______that of a 100 watt bulb, if both run on the same voltage. A. one half B. one fourth C. four times D. double Answer: C
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Two light bulbs are installed in two sockets, the sockets are connected in series, and power is then applied to the combination so that both bulbs light. If one of the bulbs is then removed from its socket, the other one will A. get brighter. B. remain equally bright. C. get dimmer. D. go out. Answer: D 7. What is the best way to ensure that a 40 watt bulb and a 60 watt bulb have the same voltage applied to them? A. Connect the bulbs in series with the power supply ( ) like this: 40 60 B. Connect the bulbs in parallel with the power supply like this: 4 0 60 C. Separately connect the bulbs to two power supplies rated at the same voltage 40 60 D. Can’t be done: different wattage bulbs must always have different voltages. Answer: B 8. A 40 W bulb and a 60 W bulb are connected in series with a 120 V power source. Which of the following is true for this arrangement? A. The 40 W bulb is brighter than the 60 W bulb. B. The 60 W bulb is brighter than the 40 W bulb. C. The 60 W bulb is brighter than it would be if the 40 W bulb were replaced by a wire. D. The 40 W bulb is brighter than it would be if the 60 W bulb were replaced by a wire. Answer: A 9. A 40 W bulb and a 60 W bulb are connected in parallel, and powered by 120 V from household wiring (see sketch). If the 40 W bulb is then removed from its socket, the 60 W bulb will A. get brighter. B.
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This note was uploaded on 07/10/2008 for the course PHYS 1030 taught by Professor Ross during the Summer '08 term at Northeast State.

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p101chap13pretest - Chapter 13: Electric Circuits 1. A...

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