Question

Which statement best summarizes the law of conservation of energy?
Responses
A When work is done, energy is lost.When work is done, energy is lost.
B Heat flows from a warm body to a cold body.Heat flows from a warm body to a cold body.
C If energy disappears in one form, it must reappear in another.If energy disappears in one form, it must reappear in another.
D The fewer the number of valence electrons, the better the insulator.The fewer the number of valence electrons, the better the insulator.
E Once energy is lost from a system, it can never be recovered.Once energy is lost from a system, it can never be recovered.

Answer 1

C — Energy cannot be created or destroyed; if it "disappears" in one form it must reappear in another (energy is conserved).