Exercises XII — task. Science CBSE, Class 9.

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Find the energy in

$kWh$ consumed in

$10\ hours$ by four devices of power

$500\ W$ each.

The formula to calculate the energy consumed by an electric device is,

$Energy\ consumed\ =\ \frac{Power}{Time\ taken}$
$Energy\ consumed\ =\ Power \times Time\ taken$

Substitute the values,

Energy consumed by an electric device

$=$

$kWh$

Energy consumed by four equal rating devices

$=$

$kWh$

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