Chapter - 4 Work and Energy

Q&A -Ask Doubts and Get Answers

Q
Work and Energy

Question:

Find the energy in kWh consumed in 10 hours by four devices of power 500 W each. 

Answer:

Given:

Power of each device = 500 W = 0.5 kW

There are total 4 devices of equal power, therefore

Combined power of 4 devices, P = 4 	imes 0.5 kW = 2 kW

Time duration, t = 10 h

We know,

Energy consumed by an electric device can be obtained using the expression,

Power = frac{Energy}{Time}

Energy = Power 	imes time

Energy = 2 kW 	imes 10 h = 20 kWh

Hence, the energy consumed by four equal rating devices in 10 h will be 20 kWh.


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