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What is the input impedance of a transistor amplifier circuit if I1 = 10mA, I2 = 20mA, V1 = 25V, V2 = 15V?

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What is the input impedance of a transistor amplifier circuit if I1 = 10mA, I2 = 20mA, V1 = 25V, V2 = 15V?

(a) 0.5kΩ

(b) 2kΩ

(c) 1.5kΩ

(d) 2.5kΩ

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The question is from Analysis of Transistor Amplifier Circuit using h-parameters in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Right option is (d) 2.5kΩ

The explanation: To calculate the input impedance of a transistor amplifier circuit, we use the below formula. The input impedance of a transistor amplifier is the ratio of input voltage to input current. Given the values of I1 = 10mA and V1 = 25V:

Input impedance = Zi = V1 / I1 = 25 / 10 = 2.5kΩ

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