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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?

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Answer:

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

Step-by-step 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.

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