what is potentiometers
Potentiometers are a form of electrical resistors. While not designed to carry a great deal of electrical current, they are often ideal for small jobs. A potentiometer is helpful in such common tasks as adjusting the volume level on a radio, or changing channels on some types of television sets.
For the measuring instrument, see Potentiometer (measuring instrument). A potentiometer, informally a pot, is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.