# Q. 14.     An electric heater is rated 1500 W. How much energy does it use in 10 hours?

The relation between energy and power is given by :

Energy  =   Power $\times$  Time

Thus the energy used in 10 hours is :

$E\ =\ 1500\times 10\ =\ 15000\ Wh\ =\ 15\ KWh$

Hence the energy used by the heater is  15 KWh.

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