First slide

Transistor

Question

A transistor is used in a common-emitter mode in an amplifier circuit. When a signal of 20 mV is added to the base-emitter voltage, the base current changes by 20 µA and the collector current changes by 2 mA. The load resistor in 5 k $Ω$ . What is the value of $β$ ?

Moderate

A

10
B

100
C

1000
D

$10^{6}$

Solution

$β = \frac{{ΔI}_{c}}{{ΔI}_{b}} = \frac{2 mA}{20 μA} = \frac{2 \times 10^{- 3}}{20 \times 10^{- 6}} = 100$

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