Consider the following circuit, where source current = 10mA, hfe = 50, hie = 1100Ω, then for the transistor circuit, find output resistance RO and input resistance RI.

Consider the following circuit, where source current = 10mA, hfe = 50, hie = 1100Ω, then for the transistor circuit, find output resistance RO and input resistance RI. Correct Answer RO = ∞, RI = 21Ω

Since hoe is not given, we can consider it to be small; i.e 1/hoe is neglected, open circuited. Hence output resistance RO = ∞. Input resistance = hie/(1 + hfe) = 1100/51 ≅ 21Ω.
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