Question

conventional energy
and Non-conventional energy resources ​

Answer 1

Conventional sources of energy (e.g. coal, petroleum and natural gas) are non-renewable sources of energy. Non-conventional sources of energy (e.g. solar and wind energy) are renewable sources of energy. They have been in use since a long time. For example, firewood and coal have been in use since a long time.

Answer 2

The energy obtained from non-conventional sources is known as non-conventional energy. ... These sources of energy are not abundant, present in limited quantity, e.g. coal, petroleum, natural gas. These sources of energy are abundant in nature, e.g. solar energy, wind energy, tidal energy, biogas from biomass etc.