Page 99 - Teach Yourself Electricity and Electronics

Quiz 79

8. A source delivers 12 V and the current is 777 mA. Then the best expression for
the resistance is:
A. 15 .
B. 15.4 .
C. 9.3 .
D. 9.32 .
9. The voltage is 250 V and the current is 8.0 mA. The power dissipated by the
potentiometer is:
A. 31 mW.
B. 31 W.
C. 2.0 W.
D. 2.0 mW.
10. The voltage from the source is 12 V and the potentiometer is set for 470 .
The power is about:
A. 310 mW.
B. 25.5 mW.
C. 39.2 W.
D. 3.26 W.

11. The current through the potentiometer is 17 mA and its value is 1.22K . The
power is:
A. 0.24 µW.
B. 20.7 W.
C. 20.7 mW.
D. 350 mW.

12. Suppose six resistors are hooked up in series, and each of them has a value of
540 . Then the total resistance is:
A. 90 .
B. 3.24 K .
C. 540 .
D. None of the above.
13. Four resistors are connected in series, each with a value of 4.0 K . The total
resistance is:
A. 1 K .
B. 4 K .
C. 8 K .
D. 16 K .