Question

What is the law of conservation of energy

Answer 1

In physics, the term conservation refers to something which doesn't change. This means that the variable in an equation which represents a conserved quantity is constant over time. It has the same value both before and after an event.

Answer 2

The Law of Conservation of energy basically says that energry cannot be destroyed or created (usually in a chemical reaction) but it can only be changed or transformed into another form.

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An example would be if you plug in a standing fan. The electrical energy from the wall socket is transformed into mechanical energy when the blades move. The electricity doesn't just disappear.