1. Plural of photocell; electronic devices that respond to light by generating an electric current or changing electrical resistance.
Usage: Also called photoelectric cells or light-sensitive cells.; Commonly used in scientific and technical contexts.

Examples

• The security system uses photocells to detect motion and trigger alarms.
• Photocells in solar panels convert sunlight into electrical energy.
• Modern cameras employ photocells to measure light levels for proper exposure.
• The automatic door opener relies on photocells to sense when someone approaches.
• Photocells are essential components in many light-activated devices.
• Scientists use photocells to measure the intensity of light in experiments.