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

3P
P
2p/ 3
P/3

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Physics
Pressure Cooker cooks faster because

It cooks the food at low pressure
The material of the cooker is a good conductor
Higher temperature is attained for cooking
Boiling point decreases with rise of pressure

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