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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Physics
A Fuse wire is characterised by

High resistance and low melting point
High resistance and high melting point
Low resistance and low melting point
Low resistance and high melting point

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