1
Question
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.
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
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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