Physics · Electrical energy and power, electrical resistivity and conductivity
The electrical energy in kilowatt hours consumed in operating ten bulbs for 10 h
The electrical energy in kilowatt hours consumed in operating ten \( 50 ~ W \) bulbs for 10 hrs/day in a month of 30 days is
- A. 1500
- B. 15000
- C. 15
- D. 150
Step-by-step solution
Total power = 10 bulbs × 50 W = 500 W = 0.5 kW. Daily usage = 10 h, so daily energy = 0.5 kW × 10 h = 5 kWh. Over 30 days: 5 kWh/day × 30 days = 150 kWh. Hence answer is 150.
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