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Find the energy in $kWh$ consumed in $10$ hours by a machine of power $500\ W$.
Power of the machine $P=500\ W$
Time taken to consume the energy $t=10\ hours$
Therefore, energy consumed by the machine $W=P\times t$
$=500\ W\times10\ hour$
$=5000\ Wh$
$=\frac{5000}{1000}\ kWh$ [Because $1\ kWh=1000\ Wh$]
$=5\ kWh$
Thus, the energy consumed by the machine $5\ kWh$
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