The conversion of energy from one source (such as coal or nuclear) which produces heat, to another source used for work (such as electricity) always involves a substantial loss of energy.
(one source (such as coal or nuclear; produces; heat) (another source; used; for work (such as electricity) (The conversion of energy from one source (such as coal or nuclear) which produces heat, to another source; involves; a substantial loss of energy; T:always)
one source (such as coal or nuclear another source The conversion of energy from one source (such as coal or nuclear) which produces heat, to another source
produces used involves
heat
for work (such as electricity
a substantial loss of energy T:always