Page 98 - Teach Yourself Electricity and Electronics

78 Basic dc circuits

2. A wiring diagram would most likely be found in:
A. An engineer’s general circuit idea notebook.
B. An advertisement for an electrical device.
C. The service/repair manual for a radio receiver.
D. A procedural flowchart.

For questions 3 through 11, see Fig. 4-7.
3. Given a dc voltage source delivering 24 V and a circuit resistance of 3.3 K ,
what is the current?
A. 0.73 A.
B. 138 A.
C. 138 mA.
D. 7.3 mA.
4. Suppose that a circuit has 472 of resistance and the current is 875 mA. Then
the source voltage is:
A. 413 V.
B. 0.539 V.
C. 1.85 V.
D. None of the above.
5. The dc voltage in a circuit is 550 mV and the current is 7.2 mA. Then the
resistance is:
A. 0.76 .
B. 76 .
C. 0.0040 .
D. None of the above.

6. Given a dc voltage source of 3.5 kV and a circuit resistance of 220 , what is
the current?
A. 16 mA.
B. 6.3 mA.
C. 6.3 A.
D. None of the above.

7. A circuit has a total resistance of 473,332 and draws 4.4 mA. The best
expression for the voltage of the source is:
A. 2082 V.
B. 110 kV.
C. 2.1 kV.
D. 2.08266 kV.