Editor
Light Sensor, IR receiver, zener diode
 |
| IR receiver |
 |
| Light Sensor |
 |
| zener diode |
1. Light Sensor: In presence of electricity it activates and works as a conductor. But when there is no light it works as non-conductor. The light sensor is a passive device that converts this “light energy” whether visible or in the infra-red parts of the spectrum into an electrical signal output. Light sensors are more commonly known as “Photoelectric Devices” or “Photo Sensors” because of the convert light energy (photons) into electricity (electrons).
2.IR receiver: We use remote every day. But how remote sends information to TV? Remote has a light in front of it. That light releases IR light. And on TV there is an IR receiver which receives the signal of remote and works. So this IR receiver receives a remote signal.
3.Zenar diode: Diode is usually used for transforming AC current into DC current. In normal temperature, Zenar diode works like a normal diode. But when the temperature gets high it works like a conductor and it doesn't stop AC current.