First slide

Transistors

Question

In a transistor circuit shown here the base current is 35μA. The value of the resistor $R_{b}$ is

Moderate

A

123.5kΩ
B

257kΩ
C

5kΩ
D

2.5kΩ

Solution

$A p p l y K V L, \Rightarrow + V_{b} - I_{b} R_{b} = 0 \Rightarrow R_{b} = \frac{V_{b}}{I_{b}} = \frac{9}{35 \times 10^{- 6}} = 257 \times 10^{3} Ω = 257 k Ω$

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