Question

When we run a 40 watt bulb for 5 hours, if 1 unit (= 1kWh) costs 2 rupees, find the bill we have to pay for this ?

Answer 1

Given : $P=40$ W $=0.04$ kW $t=5$ h

Thus total energy used in 5 hours

$E=Pt=0.04\times 5=0.2$ kWh

$\therefore$ Bill to be paid = $0.2\times 2=$ Rs $0.4$