Diode --> made from semiconductor material such as silicon
-It is used to regulate the potential difference in circuits
-It lets current flowly freely through it it ONE DIRECTION ONLY (there's a very high resistance in the reverse direction)
Light-Emitting Diodes (LED) --> emits light when a current flows through it in the forward direction
-They are being used more and more as lighting because they use a much smaller current than other forms of lighting
-They indicate the presence of current in a circuit
-Often used in appliances such as TVs to show they're switched on
-Used for numbers on digital clocks, traffic lights and remote controls
Light-Dependent Resistors (LDR) --> dependent on the intensity of light
-Bright light- resistance falls
-Darkness- resistance is highest
-Applications include, automatic nightlights, burglar detectors etc
Thermistors --> temperature dependent resistor
-Hot conditions- resistance drops
-Cool conditions- resistances goes up
-They make useful temperature detectors e.g. electronic thermostats
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