How stuff works (Radio)

       The way a radio functions is very similar to the way a telephone functions. The microphone which records the singer/entertainer converts the sound waves into electrical waves with a microphone. The sound waves make rearrange carbon grains in the microphone altering the wave of the electrical signal when electricity moves through the carbon grains. The electrical signals go to a transmitter which sends the signal over the air when it emits a strong electrical current. The transmitter emits the signal at a constant rate. Each radio station has it's own frequency which is speed over wavelength. Since each signal from each radio station has different velocities and wavelengths, the messages transmitted over the air are assigned to different frequencies, the messages do not get mixed up and are separate. This signal which gets emitted through the air is absorbed by the antenna on the radio which gets converted into sound waves through a speaker. To control the loudness of the music, a knob alters the strength of the electrical signal through a device called a potential meter which is a resistor.