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A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make

1200 revolutions
1800 revolutions
2100 revolutions
2400 revolutions

Correct Answer: 2400 revolutions

Explanation:

0.5 x 4 = 2 kWh = 2 x 1200 revolutions.

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