161
11. Which of the following is not an example of
a good conductor?
A. Copper.
B. Aluminum.
C. Rubber.
D. Gold.
12. In a circuit where voltage is held constant, if
resistance increases, current ______.
13. The unit for power is the ______.
A. ohm
B. amp
C. watt
D. coulomb
14. ______ is the relationship between resistance,
current, and voltage in electrical circuits.
15. A ______ circuit has only one path for current
fl ow.
A. parallel
B. series
C. series-parallel
D. wave
16. Find the voltage for a series circuit where
you know the current is 0.5 A and the
resistance is 25 Ω.
17. What is the total current fl ow in this circuit?
120 V
10 Ω
20 V
20 Ω
40 V
30 Ω
60 V
18. Which of the following is not an example of
a good insulator?
A. Plastic.
B. Paper.
C. Steel.
D. Rubber.
19. A resistor with a color code of green-yellow-
red-gold has a value of ______ Ω with a
tolerance of _____%.
20. A(n) ______ allows fl ow in only one direction
and can be used as a rectifi er to change ac
to dc.
21. ______ is the most commonly used
semiconductor material.
22. Incandescent bulbs use a ______ fi lament
inside a globe where the oxygen has been
removed.
A. silicon
B. carbon
C. tungsten
D. fl uorescent
23. ______ use about 75% less energy to create
the same amount of light as an incandescent
bulb.
24. What are PCBs and what are they used for?
25. A(n) ______ can test for resistance and
continuity.
A. voltmeter
B. ohmmeter
C. ammeter
D. oscilloscope
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