16. A half-watt is equal to how many milliwatts?
(a) 5,000 mW
(b) 5 mW
(c) 500 mW
(d) 50 mW
17. A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?
(a) 938 Wh
(b) 0.938 Wh
(c) 56.25 Wh
(d) 5.6 Wh
18. A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately ________.
(a) 120 V
(b) 1.2 V
(c) 12 V
(d) 6 V
19. How much continuous current can be drawn from a 60 Ah battery for 14 h?
(a) 42.8 A
(b) 428 A
(c) 4.28 A
(d) 4.2 A
20. A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is ________.
(a) 132 mW
(b) 13.2 mW
(c) 22.6 mW
(d) 226 mW
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5555555555 20. A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is ________. (a) 132 mW (b) 13.2 mW (c) 22.6 mW (d) 226 mW- 5555555555 26. A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least ________. (a) 4.8 W (b) 150 mW (c) 15 mW (d) 480 mW
- 5555555555 17. A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes? (a) 938 Wh (b) 0.938 Wh (c) 56.25 Wh (d) 5.6 Wh
- 5555555555 35. When the current through a 12 kΩ resistor is 8 mA, the power is ________. (a) 7.68 mW (b) 768 mW (c) 7.68 W (d) 76.8 W
- 5555555555 33. A 220 Ω resistor dissipates 3 W. The voltage is ________. (a) 73.3 V (b) 2.5 V (c) 25.7 V (d) 257 V