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An electric heater is rated 1500 W. How much energy does it use in 10 hours?
Power of electric heater
P = 1500W
Time, t = 10 hour
The energy used = Power × time
= 1500W × 10h
= 15000Wh
= 15 Wh
= 15 unit [∵ 1 kWh = 1 unit]
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