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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