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Solution


Q.

An electric heater is rated at 2 kW. Electrical energy costs Rs 4 per kWh. What is the cost of using the heater for 3 hours
1 12  
2 24  
3 36  
4 48  

Ans.

(2)

Consumption of electrical energy in 3 hours can be calculated by using the formula:

E=P×t  = 2   kW × 3   hours = 6   kWh 

Unit cost of electrical energy

=4per kWh

Therefore, the cost of energy used for three hours will be:
4×6=24