21. At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?
(a) 1.286 kWh
(b) 12.85 kWh
(c) 535 kWh
(d) 252 kWh
22. A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is ________.
(a) 0.58 Ah
(b) 2.1 Ah
(c) 21 Ah
(d) 58 Ah
23. A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?
(a) 1 h
(b) 200 h
(c) 2,000 h
(d) 10 h
24. The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be ________.
(a) 2 W
(b) 1 W
(c) 5 W
(d) 0.5 W
25. How many watt-hours represent 65 W used for 18 h?
(a) 11.7 Wh
(b) 1,170 Wh
(c) 11,700 Wh
(d) 117,000 Wh
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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