Photocell
(noun)
An electrical device that generates a current when exposed to light.
Origin:
Derived from the greek words 'photos' meaning 'light' and 'cell' meaning 'a small room', photocell refers to an electrical device that generates a current when exposed to light.
Examples:
- Photocells are commonly used in street lights to turn them on and off automatically.
- A photocell is the key component of a solar panel, converting light energy into electrical energy.
- Photocells are used in burglar alarms to detect any sudden changes in light levels.
- Photocells are used in many scientific experiments to measure the intensity of light.
- A photocell can be used to regulate the speed of an electric motor in response to changes in light levels.