(i) Write the three functions of three segments of a transistor. (3 marks)
(ii) Draw the circuit diagram for studying the input and output
characteristics of n-p-n transistor in common emitter configuration.
Using the circuit, explain how input, output characteristics are obtained.
(i) Emitter: Supplies the large number of majority charge carries for the
flow of current through the transistor. (1/2 mark)
Base: Controls the movement of charge carriers coming from emitter
region. (1/2 mark)
Collector: Collects a major portion of the majority carriers supplied
by the emitter. (1/2 mark)
Emitter: Heavily doped and of moderate size.
Base: Central region, thin and lightly doped.
Collector: Moderately doped and large sized.
(ii) (1 mark)
Input characteristics are obtained by recording the values of base current ,
for different values of at constant
Output characteristics are obtained by recording the values of for different
values of at constant (1/2 mark)
Also accept input/output characteristics curves for this part of the