Step 23: Biasing Diodes
A simple example of a diode is the LED (Light emitting Diode).
A diode can be forward or reverse bias.
In a circuit where DC is the voltage source, a diode can only conduct when it's forward biased. This is because DC only travels one way, from positive to negative.
In a circuit where AC is the voltage source, we can do the following:
We can FORWARD BIAS a diode - if we want it to conduct with a positive voltage.
We can REVERSE BIAS a diode - if we want it to conduct with a negative voltage.
This is because in an AC voltage the polarity alternates from positive to negative and vice versa. So the current can travel two directions the polarities change.