Physics
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

P
2P
> P
< P

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Physics
Conservation of energy refers to the fact that

No chemical reaction is 100 percent efficient
Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing
If you conserve energy you will not be as tired

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