11. A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?
(a) 20.16 kWh
(b) 201.6 kWh
(c) 2.01 kWh
(d) 8.4 kWh
12. A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is ________.
(a) 8.57%
(b) 42.85%
(c) 4.28%
(d) 85.7%
13. When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is ________.
(a) overheated
(b) shorted
(c) open
(d) reversed
14. A 33 Ω half-watt resistor and a 330 Ω half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
(a) 33 Ω
(b) 330 Ω
(c) both resistors
(d) neither resistor
15. In 0.025 W, there are ________.
(a) 25 kW
(b) 0.00025 mW
(c) 2,500 µW
(d) 25 mW
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- 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