Potentiometers are three terminal devices. Two terminals are the ends of a fixed resistive element. The third terminal is a wiper that makes an electrical connection to a variable point along the resistive element. The exact point the wiper connects to the resistive element depends on where the dial/screw driver slot is turned to.

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Diagram

Trimmer potentiometer (trimpots) are small versions of potentiometers. They tend to fit in breadboards. Some of them fit really easily, and are a very common component now.

You can get a signal voltage that is the full supply voltage, no voltage at all (a direct connection to ground), and any voltage in between them.

It is just a signal voltage because any load that needs current will throw off the voltage. It’s best to give the trimpot output voltage to the input of circuitry that needs no current from that voltage.

Video

Quick voltage divider circuit or variable resistor using trimmer potentiometer trimpot component



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