Differentiate Between N-P-N and P-N-P Transistors

some questions and answers under transistors

Questions

1.   what is a transistor

a transistor is a semiconductor device capable of amplifying input current.  a transistor consist of two P-N junction diode join back to back.

2.   differentiate between an npn and pnp transistor

when a transistor has its majority carriers as negative electrons it is said to N-P-N transistors, it is made When a p-type semiconductor is sandwiched between two n-types, symbolically it has  the arrow on the emitter pointing outward. while pnp transistor has its majority carriers as positive poles, it is made when n-type is sandwiched between two p-types semiconductors

3.   sketch the symbol of npn and pnp transistors showing emitter collector and base.

4.   briefly describe the three transistor terminals

a transistor has three terminals, the emitter, the collector and the base.  the emitter is always forward biased and highly doped  while the collector is reversed biased and also heavily doped,  and the base is slightly doped.

5.   explain the following (a)majority carriers (b)minority

carriers

(a)           majority carriers are more abundant charge carriers, are either the negative electrons or holes,  in n-type semiconductor negative semiconductors are the majority carriers while in p-type positive holes are the minority carriers.

(b)           minority carriers are the few available  charge carriers , they are the holes in N-type semiconductors and positive electrons in the P-type semiconductors.

what is a  P-N junction

what is a  P-N junction

6.   what is a P-N junction,  P-N junction is  point where two semiconductor material meet, one p-type and the other n-type, it is a boundaryt where n-type and p-type semiconductor merged.

7.   briefly describe two method of applying voltage to P-N junction.

a voltage can be applied to a p-n junction in two ways either by forward biasing or by reversed biasing, when a p-n junction is forward biased , its resistance  to flow of current is lowered and current easily flow,  while a in reversed biasing no current flow.