Arefrigerator is used for keeping food fresh for a long period of time, and refrigerators are major users of electricity. Given these facts, what requires a lot of electricity among the following options:
- riding a bicycle
 - An emergency lighting source.
 - repair cells in the human body
 - sleeping on the floor
 - visiting a dam
 - Something that take eight minutes to travel to the Earth
 - Heating a metal filament.
 - keeping food fresh for long periods of time


 

        keeping food fresh for long periods of time 