When you turn down or up the volume on devices with either a wheel or button, what actually happens that allows it to sound quieter or louder?
In: Technology
A long time ago I took a radio volume knob off and I saw that it was a cylinder with copper wire wrapped around it in a tight coil all the way down. As you turned the knob, the cylinder slid further into or out of the hole, changing the place along the length of the wire where it made contact with the rest of the circuit. The longer the amount of wire the electricity had to travel through, the more resistance, and the lower the volume. I’m sure modern ones are a lot more sophisticated, but the principle is the same.
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