Question

An electric oven rated at 500 W is connected to 230 V line and used for 2 hours daily. Calculate the cost of electric energy per month at rate of Rs.5 per kwh.

Answer 1

We know P=W/t

P=power

W=work

t=time

Now : W=Pt

=500W*2h

=0.5kW*2h

=1kWh

In 30 days,power=30*1kWh

=30kWh

If cost=Rs5

total cost=5*30=150

So cost is Rs150