Question

Name a device used to convert solar energy to heat and solar energy into electricity.

Explain the principle of working of a windmill.

Answer 1

Solar energy to heat

1. A device that converts solar energy into heat is the solar cooker.
2. A solar cooker uses the sun's radiant light to produce the heat and cook the food.

Solar energy to electricity

1. A device that converts solar energy into electricity is the solar cell.
2. A solar cell uses the sun's radiant light to convert it into electricity using light-sensing materials such as Silicon and Gallium.

The principle of working a windmill

1. The flowing wind has kinetic energy.
2. The kinetic energy of the wind rotates the windmill blades.
3. The windmills rotate the shaft connected with it.
4. The shaft connected with the armature of the generator will rotate at high speed.
5. This mechanical energy is converted into electricity by a generator.