(a) Name the device used to convert: 1. Solar energy into heat

(a) Name the device used to convert:

  1. Solar energy into heat and,
  2. Solar energy into electricity.

(b) Explain the working of windmill.

(a)

  1. Solar cooker.
  2. Solar cell.

(b) When the wind blows at a minimum speed of 15km/hr, the kinetic energy of the wind is used to rotate the blades of wind mill. The rotation energy of the blades is used to rotate the armature of the generator and generator in turn, produces electricity.