First slide

Transistor

Question

In an n–p–n transistor, current gain for common emitter configuration is 80. If the emitter current be 8.1 mA, Then the base current is ____

Moderate

A

$0.1 μ A$
B

$0.01 μ A$
C

$0.1 m A$
D

$0.01 m A$

Solution

$β = \frac{I_{C}}{I_{B}}$ $A l s o, I_{C} = I_{E} - I_{B}$
This givens,
$I_{B} = \frac{I_{E}}{81} = \frac{8.1}{81} m A = 0.1 m A$

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