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When electrical energy is converted into thermal energy, which of the following must be true?

Only the amount of electrical energy changes.
Only the amount of thermal energy changes.
The total amount of thermal energy plus electrical energy changes.
The total amount of thermal energy plus electrical energy doesn't change.

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MissPhiladelphia
I think the correct answer from the choices listed above is the last option. When electrical energy is converted into thermal energy, the total amount of thermal energy plus electrical energy doesn't change. This is base on the Law of Conservation of energy where energy cannot be created or destroyed. 

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