Select the correct statements from the following.
(i) Wind energy is renewable source of energy.
(ii) Installation cost of wind mill is low.
(iii) Wind mills are generally installed in populated areas.
(iv) Energy produced from wind mills is non-polluting.
what causes the wind to blow? what is the minimum wind velocity required to obtain useful energy with a wind mill? Electricity generated by a wind mill is another form of solar energy. Explain.