Question

1. What is impedance? How is it different from resistance?

2. In a p-type semiconductor, do the positive holes really move? Explain.

Answer 1

1.Impedance is opposition to the flow of AC current because of any three components that is resistive, inductive or capacitive.On the other hand,resistance is defined as the opposition to the flow of electrons in the circuit which is due to colisions with the ionic lattice of the conductor. . Impedance is a combination of both resistance and inductive and capacitive reactance in a circuit.

2.No, in a p-type semiconductor, the holes do not move. Actually, the electrons move in the direction opposite to the electric field and in this process they create holes at their original position. This results in an apparent motion of holes, but actually, only the electrons are moving.