Potentiometer, often abbreviated as pot, are resistance components,
whose resistance value is mechanically variable.
This is done by sliding or rotating a contact.
A potentiometer has three terminals.
If only two terminals are used,
the potentiometer acts like a variable resistor.
If all terminals are connected,
it behaves as an adjustable voltage divider.
Various sliding-, rotating and trimming potentiometer.
The nominal resistance of a potentiometer is
the resistance value between the end terminals and is
specified by the unit Ohm.
Known applications of potentiometers are as volume controls
in audio systems or sensors in joysticks...