- The Light Dependent Resistor (LDR) used for automatic contrast and brightness control in television receivers.
- The LDR is used in the infrared astronomy.
- The LDR is used in optical coding.
- Used in light activated control circuits.
- Used in light failure alarm circuits and used in light meter.
- The LDR used in smoke detectors.
- Used in the security alarm.
- The LDR also used in street light control circuits.
- It is used in camera light meters.
- Used in photosensitive relay.
- It is also used as a proximity switch.
light dependent resistor (LDR)