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(i) No current flows in the junction diode without an external battery. It is connected to a battery in two different ways. Hence two different bias are possible in junction diode.
(a) Forward bias
(b) Reverse bias
S.No. | Forward bias | Reverse bias |
1. | The P-region of Junction diode Is connected to positive terminal of battery and N-region is connected to negative terminal of battery. | The P-region Is connected to negative terminal and N-region is connected to positive terminal of the battery. |
2. | In this the width of depletion layer decreases | In this the width of depletion layer increases |
3. | Current flows in it due to majority electrons and majority holes and hence high current (mA) flows in it. The direction of current in it is from P to N. | Current flows in it due to minority electrons and minority holes and hence negligible current (in μA) flows in it. Direction of current s from N to P |
4. | The junction resistance is low | The junction resistance is high |
5. | Curve between forward voltage and forward current | Curve between reverse voltage and reverse current |
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