Physics
Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be

2p/ 3
3P
P
P/3

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Physics
Dynamo is a device for converting

Magnetic energy into electrical energy
Mechanical energy into electrical energy
Chemical energy into electrical energy
Heat energy into electrical energy

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