according to the law of energy conservation, the total amount of energy is constant, then why does the chemical energy in electric cells got used up?

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.

Explanation:

This means that a system always has the same amount of energy unless it's added from the outside. is the total internal energy of a system.

im doing test rn im going with 2 but ill give answer if itss wrong,   : )