The cell mainly used in electrical alarms is a photocell.
Photocell Functionality in Alarms
A photocell plays a crucial role in electrical alarms by converting light into electrical signals. According to provided reference information, the photocell is specifically utilized in burglar alarms due to this property.
How it Works
The operation is based on the photoelectric effect. Here's a simplified breakdown:
- Light Detection: When light strikes the photocell, it generates an electric current.
- Alarm Trigger: In a burglar alarm system, a light beam is often directed at the photocell. If an intruder interrupts this beam, the light signal is cut off.
- Signal Change: The photocell detects the absence of light, causing a change in its electrical output.
- Alarm Activation: This change triggers the alarm system, alerting the property owner or security service.
Other Applications of Photocell
Besides burglar alarms, photocells are also used for:
- Tapping light energy from the sun
- Light meters in cameras
- Automatic streetlights
