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

P/3
3P
2p/ 3
P

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Physics
Plants are dried up in winter due to frost because

Evaporation does not take place
Respiration does not take place at low temperature
Photosynthesis does not take place at such low temperature
There is mechanical loss of tissues and drought condition prevails

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Physics
A transformer

Is used to decrease or increase AC voltage
Converts DC to AC
Converts electrical energy into mechanical energy
Converts AC voltage to D.C. voltage

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