Question 86

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?

Solution

$$ power = \frac{work}{time} $$

given power = 2 kW

time = 3 hours

substituting

$$ 2 kW = \frac{work}{3} $$

solving work = 6

Electrical energy costs Rs.4 per kWh

cost of using the heater for 3 hours = $$ 6 \times 4 = Rs 24 $$

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