Question

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

(a) -0.5

(b) -2

(c) 0.5

(d) 2

I had been asked this question in examination.

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

Answer 1

The correct option is (b) -2

To elaborate: To calculate the current gain of a transistor amplifier circuit, we use the below formula. The current gain of a transistor amplifier is the ratio of output to input currents. Given the values of I1 = 10mA and I2 = 20mA.

Current gain = A = – I2 / I1 = 20 / 10 = 2.