Chapter - 4 Work and Energy

Q&A -Ask Doubts and Get Answers

Q
Work and Energy

Question:

An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Answer:

Energy consumed by an electric heater is given by the expression,

P = frac{E}{T}

E = P 	imes T

Where,

Power rating of the heater, P = 1500 W = 1.5 kW

T = 10 hour

Therefore,

E = 1.5 	imes 10 = 15 kWh


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