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Question

name the commercial unit of energy . establish a relationship b/w this unit and S.I unit of energy .

a battery lights a torch bulb .state the energy transformation envolved in this process

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Solution

The commercial unit of electric energy is kWh.

1 kWh = 1000 W × 1 hour

= 1000 W × 3600 s

= 36 × 105 Ws

= 3.6 × 106 J

A battery lights a torch bulb, in this process chemical energy is converted into electrical energy.


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