An electric bulb of rating 50 W is used for 8 hr in one day. Find the number of units of energy used by the electric bulb in a day.
50 W = 0.05 kW
Time=8hrs Energy consumed= Power×time
= 0.05 kW×8 hrs= 0.4 kWh = 0.4 unit
An electric bulb 60W is used 6 hours per day. Calculate the units of energy consumed in a day.