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Q.

An electric heater is rated 1500 W. How much energy does it consume in 10 hours?


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a

1.5 kWh

b

15 kWh

c

150 kWh

d

150 kWh 

answer is B.

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Detailed Solution

An electric heater is rated 1500 W. It will consume 15 kWh in 10 hours.
The relation between power and energy is
Energy= Power × Time
If, Power =1500 Watt, Time = 10 Hours
Then,
Power=15001000
=1.5kW Energy used,  E = P×t
⇒ E = 1.5 kWh × 10 h
⇒ E = 15 kWh
 
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An electric heater is rated 1500 W. How much energy does it consume in 10 hours?