amount of charge that produced the field and the distance from the charge (D)
100
If a posiitve and a negative charge were brought near each other, they would...
Attract each other (A).
100
Walking across a carpet is an example of charge being transferred by...
Friction (D).
200
6. If a neutral metal comb is held near an object with a negative charge, the comb will become charged by...
Induction (A).
200
7. What type of current is produced by a battery?
Direct current (C).
200
8. The type of current in your school is mostly...
Alternating Current (A).
200
9. Which of the following materials allows charges to flow easily?
An electrical conductor (C).
200
10. An electrical insulator...
a. electrons that freely move
b. more protons than electrons
c. negatively charged ions
d. electrons tightly bound to its atoms
Electrons tightly bound to its atoms (D).
300
11. Resistance is affected by a materials (Three things)...
Thickness
Length
Temperature
D. All of the above
300
12. Which of the following would reduce the resistance of a metal wire?
a. increasing its thickness
b. increasing its temperature
c. increasing its length
d. all of the above
a. increasing its thickness
300
13. What is the difference in electrical potential energy between two places in an electric field?
Potential difference (C).
300
14. Which of the following is maintained across the terminals of a battery?
a. a potential difference
b. a voltage drop
c. an electric charge
d. both A and B
d. both A and B
300
15. The current in a hair dryer measures 15 amps. The resistance of the hair dryer is 8 ohms. What is the voltage?
120 V (A).
400
16. What equation represents Ohm's law?
V = I x R (B)
400
17. How many paths through which charge can flow would be shown in a circuit diagram of a series circuit.
One (A).
400
18. Most of the circuits in your home are...
Parallel circuits (B).
400
19. What is the unit of electric power?
Watt (C).
400
20. If you know the power rating of an appliance and the voltage of the line it is attached to, you can calculate the current the appliance uses by...
Dividing the power by the voltage (D).
500
21. Which of the following provides electrical safety?
a. circuit breaker
b. fuse
c. ground-fault circuit interrupter
d. all of the above
d. all of the above
500
22. A ground-fault circuit interrupter shuts down a circuit if it...
senses unequal currents (C).
500
23. Information sent as patterns and codes in the controlled flow of electrons through a circuit is an...
Electronic signal (A).
500
24. Electronic signals that are smoothly varying signals produced by continuously changing the voltage or current in a circuit are...
analog signals (D)
500
25. A vacuum tube can be used to...
a. change alternating current into direct current
b. increase the strength of a signal
c. turn a current on or off
d. all of the above