A certain transistor has a dc emitter current of 25 mA. The value of r'e is
A)1 ▲.
B)2.5 ▲.
C)1.2 ▲.
D)25 ▲.

Question

Quizplus · Accepted Answer

The value of r'e (the emitter resistance in small signal analysis) can be approximated by the formula r'e = 26mV / I_E, where I_E is the emitter current in amperes. For a dc emitter current of 25 mA (or 0.025 A), r'e = 26mV / 0.025A = 1.04Ω, which is approximately 1Ω, making option A the correct choice.

A Certain Transistor Has a Dc Emitter Current of 25