Biasing means the electrical supply or potential difference is connected to the semiconductor device. The potential difference is of two types namely – forward bias and the reverse bias.
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Basis for Comparison |
Forward Biasing |
Reverse Biasing |
|
Definition |
The external voltage which is applied across the PN-diode for reducing the potential barrier to constitutes the easy flow of current through it is called forward bias. |
The external voltage which is applied to the PN junction for strengthening the potential barrier and prevents the flow of current through it is called reverse bias. |
|
Symbol |
|
|
|
Connection |
The positive terminal of the battery is connected to the P-type semiconductor of the device and the negative terminal is connected to N-type semiconductor |
The negative terminal of the battery is connected
to the P-region and the positive terminal of the battery is connected to
N-type semiconductor. |
|
Barrier Potential |
Reduces |
Strengthen |
|
Voltage |
The voltage of an anode is greater than cathode. |
The voltage of cathode is greater than an anode. |
|
Forward Current |
Large |
Small |
|
Depletion layer |
Thin |
Thick |
|
Resistance |
Low |
High |
|
Current Flow |
Allows |
Prevents |
|
Magnitude of Current |
Depends on forward voltage. |
Zero |
|
Operate |
Conductor |
Insulator |
