According to Law of conservation of energy,
"Energy can neither be created , nor be destroyed . I t can only be changed from one form to another."
Hence it clearly states that energy cannot be destroyed and hence energy is transformed from one form to another.
It is due to this very reason that devices are able to transform cell's chemical energy in torches to light energy .
Even the loudspeakers, earphones are able to convert electrical energy into sound energy by consuming electrical energy and converting it to various forms
Thus these devices are possible due to the law of conservation of energy.
For further reference:
https://brainly.com/question/12050604?referrer=searchResults
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