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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