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Using the necessary circuit diagram, show how the V-I characteristics of a p-n junction are obtained in (i) forward biasing (ii) Reverse biasing. How are these characteristics made use of in rectification? |
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Answer» Solution :The circuit arrangement for STUDYING the V–l characteristics of a diode are shown in Fig. (a) and (b). For different values of voltages the value of CURRENT is noted. A graph between V andis obtained as in Figure (c). From the V-l characteristic of a junction diode it is clear that it allows current to pass only when it is forward biased. So if an alternating voltage is applied across a diode the current flows only in that part of the cycle when the diode is forward biased. This PROPERTY is used to RECTIFY alternating voltages. 
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