Question

Draw the circuit symbols for p-n-p and n-p-n transistors.

Answer 1

Hint: In n-p-n transistors 2 segments of n-type semiconductor are separated by a segment of p-type semiconductor. While in the p-n-p transistor 2 segments of p-type semiconductor are separated by a segment of n-type semiconductor.

Complete step by step solution:
The schematic representations of an n-p-n and p-n-p configuration are given as

The sign of arrow in the circuit represents
1. Direction of current in circuit
2. Type of transistor
3. Emitter segment of transistor

Here 3 segments are present in transistor
(A) Emitter – It is of moderate size and heavily doped. It supplies a large number of majority carriers for the current flow through the transistor.

(B) Base – This is the central segment.
It is very thin and lightly doped.

(C) Collector – This segment collects a major portion of the majority carries supplies by the emitter. This collector side is moderately doped and larger in size as compared to the emitter.

Note: In order to draw the circuit diagram we must know about the direction of current and doping & thickness of emitter, collector and base.