Q. 23

(a)



(b)



(i) Name the type of a diode whose characteristics are shown in Fig. 14.9 (A) and Fig. 14.9(B).

Answer :

Fig.14.9(A) is the characteristic of any PN junction diode. The first quadrant represents the forward bias of the diode. P is the point where it reaches the break down voltage. Depending on the value of P we can further classify them to zener or normal PN junction diode.


Fig.14.9(B) is the characteristic of photo electric diode.


(ii) What does the point P in Fig. (A) represent?


P is called the knee or the breakdown voltage. At this point the current vigorously increases.


(iii) What does the points P and Q in Fig. (B) represent?


We can see that at point Q, V = 0. Current is maximum at this point. At point Q current completely vanishes. This voltage at this point is called the stopping potential.


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