Work, Power and Energy – Exercise – 1

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

Answer
Answer : (a)
Explanation
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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

Answer
Answer : (c)
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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

Answer
Answer : (c)
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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

Answer
Answer : (a)
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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

Answer
Answer : (b)
Explanation
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