An electric heater is rated at 2kW. Electrical energy costs ₹ 4 per kWh. What is the cost of using the heater for 3 hours?
Energy consumed = P x t = 2 X 3 = 6kWh
Total cost = 6 x cost per unit
Cost per unit = Rs. 4 per kWh
Therefore, total cost = 6 x 4 = Rs 24