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Five types of DC motor are :
1. Permanent magnet DC motor
2. Separately excited DC motor
3. DC shunt- wound motor
4. DC series-wound motor
5.DC compound motors ---
a. Cumulative compound.
b. Differentially compounded.
The Universe is unevenly heated by the sun , such that the poles receive less energy from the sun then the equator, along with this, dry land heats up or cools down even quickly than the seas do. The differential heating drives a world wide atmospheric convection system reaching from the universe surface to the startosphere which acts as a virtual ceiling. Most of the energy stored in these wind movements can be found at high aptitudes where continues wind speeds of over 160 km/h or 99 mph occur.
Basically, the wind energy is converted through friction into diffuse heat throughout the Earth's surface and the atmosphere. The total amount of economically extractable power available from the wind is considerably more than present human power use from all sources.