First slide

Transistor

Question

In a transistor circuit, the base current changes from $30 μ A t o 90 μ A .$ If the current gain of the transistor is 30, the change in emitter current is

Moderate

A

1.60 mA
B

0.96 mA
C

1.22 mA
D

1.86 mA

Solution

(4)
$\begin{array}{l} \frac{Δ I_{C}}{Δ I_{B}} = β \Rightarrow \frac{Δ I_{C}}{90 - 30} = 30 \Rightarrow Δ I_{C} = 1800 μ A = 1.8 m A \\ ∴ Δ I_{E} = Δ I_{C} + Δ I_{B} = 1800 μ A + 60 μ A = 1.86 m A \end{array}$

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