Question

In a pnp transistor operating in active region, the main stream of current is_________



a.Drift of holes



b.Drift of electrons



c.Diffusion of holes



d.Diffusion of electrons

Answer 1

c is the correct answer

Answer 2

In a pnp transistor operating in active region, the main stream of current is diffusion of holes.

• The base and collector junction of a PNP transistor is reverse biassed.
• Minority carriers in the base (n-type) region are holes that are drifting into the base from the p-type emitter.
• The holes diffuse into the collecting zone as a result of the base's high concentration of holes.
• The current is made up of the diffusion of holes from the high concentration (emitter) to the low concentration (base).

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