First slide

Transistor

Question

In the following common emitter circuit if $β = 100, V_{CE} = 7 V, V_{BE} is negligible, R_{c} = 2 kΩ$ , then I_B =

Moderate

A

0.01 mA
B

0.04 mA
C

0.02 mA
D

0.03 mA

Solution

$\begin{array}{rcl} V_{CC} & = & V_{CE} + I_{C} R_{c} \\ 15 & = & 7 + (I_{c} \times 2 \times 10^{3}) \\ I_{C} & = & 4 mA \\ β & = & \frac{I_{c}}{I_{B}} \\ I_{B} & = & \frac{I_{c}}{β} = \frac{4}{100} mA = 0.04 mA \end{array}$

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