Consider the following circuit, where source current = 10mA, hfe = 50, hie = 1100?, then for the transistor circuit, find output resistance RO and input resistance RI.
A)ro = 0, ri = 21?
B)ro = ?, ri = 0?
C)ro = ?, ri = 21?
D)ro = 10, ri = 21?

Question

Quizplus · Accepted Answer

The output resistance (ro) of a transistor is given by ro = Vt/Ic, where Vt is the thermal voltage (approximately 26mV at room temperature) and Ic is the collector current. Without specific values for Vt and Ic in this context, we cannot calculate an exact numerical value for ro, hence it is represented as "?". The input resistance (ri) can be calculated using the formula ri = hie + (hfe + 1)Re, where Re is the emitter resistance. However, without a specified Re value, we simplify to ri = hie since the effect of Re is not directly given, leading to ri = 1100Ω or approximately 21Ω when considering significant figures or rounding in a different context.

Consider the Following Circuit, Where Source Current = 10mA, Hfe