Electric Energy

What makes and converted back to sound energy and electricity?

In a phone, making and re-convert the energy of the two?

a microphone converts the voice to a speaker converts electrical power to the voice signals http://images.google.ca/images?hl=en&um=1&sa=1&q=telephone+handset+diagram&btnG=Search+images&aq=f&oq = & start = 0 A

Electric Potential Energy

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