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
27. In 40 kW, there are ________.
(a) 0.4 mW
(b) 40,000 W
(c) 400 W
(d) 5,000 W
28. Three hundred joules of energy are consumed in 15 s. The power is ________.
(a) 2,000 W
(b) 2 W
(c) 20 W
(d) 200 W
29. If it takes 400 ms to use 12,000 J of energy, the power is ________.
(a) 30 kW
(b) 30 W
(c) 3 W
(d) 300 kW
30. If you used 400 W of power for 30 h, you have used ________.
(a) 1.3 kWh
(b) 13.3 kWh
(c) 1.2 kWh
(d) 12 kWh
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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