24. which energy conversion occurs in an operating electrolytic cell? (1) chemical energy to electrical energy
(2) electrical energy to chemical energy
(3) nuclear energy to thermal energy
(4) thermal energy to nuclear energy

2 - electrical energy to chemical energy

This type of cell goes through a redox reaction when you apply electrical energy to it. It is basically a fancy term to describe what you use when you electrolyse a substance to decompose compounds.

They can measure  the amount of energy gained or lost