an electronic device whose electrical properties are modified by the action of light

a cell whose electrical properties change when light falls on it. Such cells are used in camera light meters, television camera tubes, and automatic detection devices.

A transducer which converts electromagnetic radiation in the infrared, visible, and ultraviolet regions into electrical quantities such as voltage, current, or resistance. Also called photo cell.

A device for measuring light intensity that works by converting light falling on, or reach it, to electricity, and then measuring the current; used in photometers.

Light sensitive device in a photoelectric switch that allows the electrical circuit to stay open by generating electrical current.

(Also called photo cell.) A transducer that converts electromagnetic radiation in the infrared, visible, and ultraviolet regions of the electromagnetic spectrum into electrical quantities such as voltage, current, or resistance. See photoelectric effect.