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
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Air layer between two shirts works as good conductor
No radiation of heat takes place
Air layer between two shirts behaves like insulating media
Two thin shirts become thicker so prevent transmission of heat

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