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4. Work and Energy
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Q33 of 146 Page 163

What is the meaning of the symbol kWh? What quantity does it represent?

KWh means Kilowatt hour. It is the commercial unit of measurement of electrical energy.

1 kWh = 3.6 * 106 J


It can be defined as the amount of electrical energy consumed when an electrical appliance of 1KW power runs for one hour.


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State and explain the law of conservation of energy with an example.

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Explain how, the total energy a swinging pendulum at any instant of time remains conserved. Illustrate your answer with the help of a labeled diagram.

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How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?

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Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).

Questions · 146
4. Work and Energy
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