Name the device which directly converts solar energy into electrical energy.
Hence, the device used to convert solar energy into electrical energy is a solar cell.
Name the device which converts mechanical energy into electrical energy.
Name the device which converts electrical energy into mechanical energy.
Name a device used to convert solar energy to heat and solar energy into electricity.
Explain the principle of working of a windmill.
Name a device which converts electrical energy into mechanical energy. State the principle on which it is based.