Physics
The earth-wire of a cable is connected to

Short circuitry of the appliance
The filament of the appliance
The outer metallic body of the appliance
The fuse of the appliance

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Physics
Conservation of energy refers to the fact that

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

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