Circuit Devices
- Created by: Antonia Loizou
- Created on: 20-05-13 19:03
Diode
- Made from a semi-conducting material such as silicon
- regulates potential difference in circuits
- lets current flow freely in one direction but not the other (high resistance in the other direction)
- are really useful in electronic circuit
Light Emitting Diodes (LEDs)
- they emit light when the current flows through it in the forward direction
- they are being used more as lighting because they use a much smaller current than other forms of lighting
- they show the presence of a current in the circuit, are often used in appliances to show that they are on
- Uses: DIGITAL CLOCKS, in TRAFFIC LIGHTS and in REMOTE CONTROLS
Light-dependent resistor (LDR)
- it is dependent on the intensity of the light
- in bright light the residtance falls
- in darkness the resistance is highest
- Uses: AUTOMATIC NIGHT LIGHTS, OUTDOOR LIGHTING and BURGLAR DETECTORS
Thermistor
- it is a temperature dependent resistor
- in hot conditions the resistance drops
- in cool conditions the resistance increases
- Uses: TEMPERATURE DETECTORS, CAR ENGINE TEMPERTURE DETECTORS and ELECTRONIC THERMOSTATS
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