Question

State and explain the law of conservation of energy with an example.

Answer 1

1. Energy can be defined as the ability to do work.
2. The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.
3. According to the law of conservation of energy, the total energy of an isolated system remains conserved.
4. For example in radio electrical energy causes the speaker's diaphragm to vibrate and produce sound hence electrical energy is converted into kinetic energy and then it gets converted into sound energy.
5. The energy transformation can be written as

Electrical energy$\to$kinetic energy$\to$sound energy

6. Hence no energy is lost here. But energy gets converted from one form to another.