The qualities of an ideal source of energy are followings :-
(1) It is easily accessible.
(2) It is easy to store and transport.
(3) It is economical.
(4) It is capable of giving an adequate amount of useful energy.
(5) It does a huge amount of work per unit mass. (6) It produces less amount of smoke.
Oil,coal, nuclear or natural gas are the energy sources that consider to be exhaustible.
