An electric heater of rating 1000 W is used for 5 hrs per day for 20 days. The electrical energy utilized is :
Answer & explanation
Correct answer: option 3
When some of the electrical appliances are used then the energy utilised is given by the product of the power of the appliances and the time period.
We have given the power of the electric heater : 1000 W = 1 kW
and the time period is 20 × 5 = 100 hr
Electrical energy = Power × Time
Electrical energy = 1 × 100
Electrical energy = 100 kWH