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Using up energy is basically converting energy from its original form to such a form in which it becomes useless or it is converted to less usable form.

FOR EXAMPLE - When you use electricity to light a bulb. electrical energy is converted to heat energy which is in turn converted to light energy.

Now you cannot get back heat energy from that light and hence you cannot get back electrical energy.

So here electrical energy is converted to such a form in which is cannot be used further.

It is said to be used

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13y ago

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