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Today we will be talking about phones,First there is a microphone that when you talk it will make sound.
The phone base(cell tower) receives the radio signals from the handset,it changes them into electrical signals.
The electronic phone wires send electrical signals outside the house to the cell tower
Now after you speak into the microphone the other person is talking and you need to hear them that is when the earpiece comes into play the earpiece turns electrical signals into sound waves.
That is how phones work.
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