First slide

Transistors

Question

The current gain of a transistor in common emitter circuit is 40. The ratio of emitter current to base current is R , then R is

Moderate

A

41
B

42
C

40
D

43

Solution

$\begin{array}{l} C u r r e n t G a i n i n c o m m o n C E : β = 40 \\ \Rightarrow β = \frac{I_{c}}{I_{b}} = 40 \end{array}$
$\begin{array}{l} T o f i n d : \frac{I_{e}}{I_{b}} = ? \end{array}$
$\begin{array}{l} W e k n o w, I_{e} = I_{b} + I_{c} \end{array}$
$\Rightarrow \frac{I_{e}}{I_{b}} = \frac{I_{b}}{I_{b}} + \frac{I_{c}}{I_{b}} = 1 + 40 = 41$

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