The input resistance of a common emitter amplifier is 330 Ω and the load resistance is 5 kΩ . A change of base current is 15 μ A results in the change of collector current 1 mA . The voltage gain of the amplifier is

Question

The input resistance of a common emitter amplifier is 330 Ω and the load resistance is 5 kΩ . A change of base current is 15 μ A results in the change of collector current 1 mA . The voltage gain of the amplifier is, 1000, 10001, 1010, 1100

MARKS App · Accepted Answer

Given ∆ I c = 1 mA = 10 - 3 A ∆ I b = 15 μA = 15 × 10 - 6 A R L = 5 kΩ = 5 × 10 3 Ω R i = 330 Ω The voltage gain of an amplifier is given by A r = ∆ I c × R L ∆ I b × R i = 10 - 3 × 5 × 10 3 15 × 10 - 6 × 330 = 100000 99 ≈ 1010

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