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# Find the Energy in Kw H Consumed in 10 Hours by Four Devices of Power 500 W Each. - CBSE Class 9 - Science

ConceptRate of Doing Work

#### Question

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

#### Solution

Energy consumed by an electric device can be obtained with the help of the expression for power,

P=W/T

Where,

Power rating of the device, P = 500 W = 0.50 kW

Time for which the device runs, T = 10 h

Work done = Energy consumed by the device

Therefore, energy consumed = Power × Time

= 0.50 × 10 = 5 kWh

Hence, the energy consumed by four equal rating devices in 10 h will be 4 × 5 kWh = 20 kWh = 20 Units.

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#### APPEARS IN

NCERT Solution for Science Textbook for Class 9 (2018 to Current)
Chapter 11: Work and Energy
Q: 20 | Page no. 159
Solution Find the Energy in Kw H Consumed in 10 Hours by Four Devices of Power 500 W Each. Concept: Rate of Doing Work.
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