Question

A bulb of rating 100w 220v is used for 5 hours daily for a month of 30 days how many units of electric energy are consumed by the bulb in one month

Answer 1

We know that

Electric energy (in kWh) =

power (in W) * time (in Hour) /1000

Here the power of bulb = 100W

Time consumed = 5 hr

no. of days =30 days

so energy =

100W * 5 hr * 30days/1000

5 * 3 = 15kWh

Thus the energy consumed by the bulb is 15kWh in 30 days.....