Diodes allow current to flow in one direction only.

1
Diodes allow current to flow in one direction
only. They have a very high resistance in the
reverse direction.
2. Light dependent resistor (ldr)
4
An LDRs resistance decreases as the amount of
light falling on it increases. USE
street lights
2. Thermistor
5
A thermistors resistance decreases as the
temperature rises.
USE temperature sensor, fire alarm