Question

Pick the best description of energy efficiency.

A. Efficiency is equal to the ratio of energy you put in to the energy you get out.

B. Efficiency is equal to the ratio of energy you get out to the energy you put in.

C. Efficiency is equal to the sum of the energy you put in to the energy you get out.

Answer 1

B. Efficiency is equal to the ratio of energy you get out to the energy you put in because the less you use the more efficient you are.