Conventional non conventional?

The answer is a matter of opinion. Different people have different answers. My opinion is: Non-conventional is best.

conventional and non-convetional sources of energy difine and give the example

Conventional (or usual) sources of energy (electricity) are coal, oil, wood, peat, uranium. Non-conventional (or unusual) sources of energy include: Solar power Hydro-electric power (dams in rivers)...

Sources of what?

Uranium is a conventional resource.