An electric kettle is rated $^{'} 2.5 k W, 250 V^{'}$ . Find the cost of running the kettle for two hours at Rs. $5.40$ per unit.

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Solution

Given,
Power of kettle , $p = 2.5 k w$
Voltage, $V = 250 V$
Time, $t = 2 h$
As, $E n e r g y, E = P x t$
$= 2.5 x 2 = 5 k w h$
Cost per unit of energy $= R s .5 .40$
Cost for kwh of energy $= 5.40 \times 5 = R s .27$

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