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L. Red, Green, Yellow, Blue LEDs
Light Emitting Diode (LED) LEDs are solid state devices that emit light when electricity
passes through them. They are directional and need to go in the circuit the right way
around.
Once a certain "on" threshold voltage is reached (about 2V for a red LED) the current
through an LED rises very quickly with the voltage. In most applications, a resistor is
needed to protect the LED from being overloaded due to this effect.
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