A refrigerator is used for keeping food fresh for a long period of time.
Refrigerators are major users of electricity.
Keeping food fresh for a long period of time requires a lot of electricity.
What requires a lot of electricity?

a. riding a bicycle
b. An emergency lighting source.
c. repair cells in the human body
d. sleeping on the floor
e. visiting a dam
f. Something that take eight minutes to travel to the Earth
g. Heating a metal filament.
h. keeping food fresh for long periods of time