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The electrical energy in kilowatt hours consumed in operating ten \( 50 ~ W \) bulbs for 10 hrs/day in a month of 30 days is

1. 1500
2. 15000
3. 15
4. 150

Correct answer: 150

Solution

Ten 50 W bulbs draw a total of 500 W, which is 0.5 kW. Running for 10 hours per day over 30 days gives 300 hours, so the energy used is 0.5 × 300 = 150 kWh.

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