Physics 101

Homework #9

1) Electrons are made to flow in a wire when there is
A) an imbalance of charges in the wire.
B) more potential energy at one end of the wire than the other.
C) a potential difference across its ends.

2) A coulomb of charge that passes through a 6-volt battery is given
A) 6 joules. B) 6 amperes. C) 6 ohms. D) 6 watts. E) 6 newtons.

3) In an ac circuit, the voltage in a wire
A) increases via the inverse square law.
B) changes magnitude and direction with time.
C) is everywhere the same.
D) is non-existent.

4) A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?
A) 5 V. B) 10 V. C) 15 V. D) 20 V. E) more than 20 V.

5) The electric power of a lamp that carries 2 A at 120 V is
A) 1/6 watts. B) 2 watts. C) 60 watts. D) 20 watts. E) 240 watts.

6) On some early automobiles both headlights went out when one bulb
burned out. The headlights must have been connected in
A) parallel B) perpendicular. C)series. D) haste.

7) A circuit breaker serves the same purpose as
A) a switch. B) a fuse. C) a capacitor D) a battery. E) none of these.

8) A capacitor is used to store
A) charge. B) energy. C) both D) neither.

9) What is the power rating of a light bulb if 0.8 A flow through it
when it is connected to a 120-volt outlet?
A) 12 W. B) 15 W. C) 60 W. D) 96 W. E)120 W.

10) Compared to a single lamp connected to a battery, two identical
lamps connected in series to the same battery will carry

a) more current b) less current c) the same current