TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
School lab rotary potentiometer. Potentiometers are a type of variable resistor. On rotary potentiometers turning the knob (black, centre) varies the resistance to electric current across the metal contacts (gold). Potentiometers are used in devices such as light dimmers and volume controls. This is the type typically used for educational purposes in school laboratories.
Model release not available. Property release not required.