Question

differefnce b/w commercial sources of energy non-commercial sources of energy.

Answer 1

Commercial source of energy is the one used for commercial and business purposes. Such a kind of energy source is costlier and usually artificial, made for some purpose and thus has limited usage.
Non Commercial source of energy is the one which is used for domestic purpose and for using it other than commercial use. Such a source is cheaper and is both natural and artifiacial.