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5. An example of an electrical insulator is
KEY TERMS
a. graphite.
b. glass.
alternating current (p. 150) c. aluminum.
amp (p. 147) d. tungsten.
ampere (p. 147) 6. The electrical potential difference between two points in a circuit
coulomb (p. 143) is measured in units of
Coulomb’s law (p. 144) a. volt.
b. amp.
direct current (p. 150)
c. coulomb.
electric circuit (p. 147)
d. watt.
electric current (p. 146)
7. The rate at which an electric current flows through a circuit is
electric field (p. 144) measured in units of
electric generator (p. 162) a. volt.
electrical conductors (p. 142) b. amp.
electrical resistance (p. 150) c. coulomb.
d. watt.
electromagnet (p. 158)
8. The law that predicts the behavior of electrostatic forces acting
electromagnetic induction (p. 161)
through space is
electrostatic charge (p. 141) a. the law of universal gravitation.
force field (p. 144) b. Watt’s law.
fundamental charge (p. 143) c. Coulomb’s law.
magnetic domain (p. 157) d. Ohm’s law.
magnetic fi eld (p. 154) 9. What type of electric current is produced by fuel cells and
solar cells?
magnetic poles (p. 154)
a. ac
ohm (p. 150)
b. dc
Ohm’s law (p. 150) c. 60 Hz
parallel circuit (p. 166) d. 120 Hz
series circuit (p. 165) 10. The electrical resistance of a conductor is measured
short circuit (p. 169) in units of
transformer (p. 162) a. volt.
b. amp.
volt (p. 146)
c. ohm.
watt (p. 152) d. watt.
11. According to Ohm’s law, what must be greater to maintain the
APPLYING THE CONCEPTS same current in a conductor with more resistance?
a. voltage
b. current
1. Electrostatic charge results from c. temperature
a. transfer or redistribution of electrons. d. cross-sectional area
b. gain or loss of protons.
c. separation of charge from electrons and protons. 12. A kilowatt-hour is a unit of
d. failure to keep the object clean of dust. a. power.
b. work.
2. The unit of electric charge is the c. current.
a. volt. d. potential difference.
b. amp.
c. coulomb. 13. If you multiply volts by amps, the answer will be in units of
d. watt. a. power.
b. work.
3. An electric field describes the condition of c. current.
space around d. potential difference.
a. a charged particle.
b. a magnetic pole. 14. Units of joules per second are a measure called a (an)
c. a mass. a. volt.
d. all of the above. b. amp.
c. ohm.
4. A material that has electrons that are free to move throughout d. watt.
the material is a (an)
a. electrical conductor. 15. A lodestone is a natural magnet that attracts
b. electrical insulator. a. iron.
c. thermal insulator. b. cobalt.
d. thermal nonconductor. c. nickel.
d. all of the above.
172 CHAPTER 6 Electricity 6-34