Photoresistor
part · 1873 · Electric age
A light-sensitive resistor (selenium, Smith).
Principles and materials it uses
- Photovoltaic effect — uses. Photoconductivity.
- Semiconductor — is made of. Selenium and cadmium sulfide are semiconductors.
- Electrical resistance — uses. Light changes the resistance.
Where it is used
- Street light — is part of. Switching on at dusk.
What it is a kind of
- Resistor — is a kind of. A resistor.