Why does more energy go into something than come out?

Answer 1

There are always losses in using energy. Some examples:

1. A car engine uses only 30-40 percent of the energy in the gasoline, the rest is rejected in the radiator and the exhaust

2. An electric motor is better at using most of the electric power supplied, but still loses some energy in heating of the motor windings and in friction of the bearings

3. Boiling an electric kettle-you might think that all the electric power is used to heat the water, but some must be lost from the outside of the kettle to the surrounding air.

Generally machines always lose some heat which is not usefully used, by thermal losses to the environment or by internal friction

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Answer 2

There are always losses in using energy. Some examples:

1. A car engine uses only 30-40 percent of the energy in the gasoline, the rest is rejected in the radiator and the exhaust

2. An electric motor is better at using most of the electric power supplied, but still loses some energy in heating of the motor windings and in friction of the bearings

3. Boiling an electric kettle-you might think that all the electric power is used to heat the water, but some must be lost from the outside of the kettle to the surrounding air.

Generally machines always lose some heat which is not usefully used, by thermal losses to the environment or by internal friction.

Answer 3

This can be explained by the principle of energy conservation, which states that energy cannot be created or destroyed, only transferred or converted. In most systems, some energy is lost as heat or other forms of non-useful energy, resulting in less energy being output compared to input. This is known as energy dissipation or energy loss.