Biased Diodes

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A diode is a component that allows current to flow in direction only.
It is a component with leads, called the cathode and the .
The is normally marked with a silver or coloured band or the symbol '-'.

If the anode is connected to a voltage than the cathode, current will flow from anode to cathode.
This is called bias.

If the diode is put in the circuit back to front, so that the voltage at the cathode is higher than the voltage at the anode, the diode will not conduct . This is called bias.