Question: Q. 3. (i) Describe briefly, with the help of a diagram, the roleof the two important processes involved in the formation of a
Name the device which is used as a voltage regulator. Draw the necessary circuit diagram and explain its working.
U] R [OD I, II, III 2012]
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Solution:
Ans. (i) For diagram see Q. 1(a) Long Answer Type Questions.
The two processes are
(a) Diffusion
(b) Drift
Diffusion : Holes diffuse from
Drift : The motion of charge carriers, due to the applied electric field
(ii) Name of device : Zener Diode 1 [Note : for diagram see Q. 4 (ii) (SATQ-II)] 1 Working : Any increase / decrease in the input voltage results in an increase / decrease of the voltage drop across
[CBSE Marking Scheme, 2012] 1/2
