A 2 kW heater, a 200 W TV and three 100 W lamps are all switched on from 6 p.m. to 10 p.m. What is the total cost at Rs. 5.50 per kWh ?

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Solution

We know that $,$
Total energy conserved $,$ $E = p \times t$
$= [2 + 0.2 + 3 \times 0.1] \times 4 h r$
$= 2.5 \times 4 R w h$
$= 10 R w h$
$R s 5.50 = 10 \times 5.50 = R s 55$
We get, $R s 55.$

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