Question

if the rate of cost is rs2 per kWh then a 500W kettle operating for 30 minutes will cost?

Answer 1

power of kettle= 500 w

time= 30 minutes

rate of cost= 2 per kwh

energy= 500/1000 x 30

            = 15 kwh

cost= 15 x 2

      = Rs 25 kwh

hope it will help you.