Question

explain the working principle and the energy change taking place in a generator and moving coil microphone?

Answer 1

Sound—energy we can hear—travels only so far before it soaks away into the world around us. Until electrical microphones were invented in the late 19th century, there was no satisfactory way to send sounds to other places. You could shout, but that carried your words only a little further. You couldn't shout in New York City and make yourself heard in London. And you couldn't speak in 1715 and have someone listen to what you said a hundred years later! Remarkably, such things are possible today: by converting sound energy into electricity and information we can store, microphones make it possible to send the sounds of our voices, our music, and the noises in our world to other places and other times.

Microphones look very different from loudspeakers so most people never realize how similar they are. If you've read our article on loudspeakers, you'll already know how microphones work—because they're literally loudspeakers working in reverse!

In a loudspeaker, electricity flows into a coil of metal wire wrapped around (or in front of) a permanent magnet. The changing pattern of electricity in the coil creates a magnetic field all around it that pushes against the field the permanent magnet creates. This makes the coil move. The coil is attached to a big flat disc called a diaphragm or cone so, as the coil moves, the diaphragm moves too. The moving diaphragm pushes air back and forth into the room and creates sound waves we can hear.

Answer 2

THE VOICE COIL IS SITUATED IN THE MAGNETIC FIELD.THE DIAPHRAGM CONNECTED TO THE VOICE COIL VIBRATES IN ACCORDANCE WITH THE SOUND WAVES FALLING ON IT.AS A RESULT ELECTRICAL SIGNALS CORRESSPONDING TO THE SOUND WAVES ARE GENERATED IN THE VOICE COIL.IN THE MICROPHONE ,MECHANICAL ENERGY IS CONVERTED TO ELECTRICAL ENERGY.