An electric kettle is rated '2.5 kW, 250 V'. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.

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Solution

Given, Power of kettle,
p = 2.5 kw Voltage,
V = 250 v Time,
t = 2 h As,
Energy, E = P × t = 2.5 × 2 = 5 kwh
Cost per unit of energy = Rs. 5.40
Cost for 5 kwh of energy = 5.40 × 5 = Rs. 27

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