First slide

Transistors

Question

In a transistor circuit shown here the base current is 25µA. The value of the resistor $R_{b}$ is

Moderate

A

400kΩ
B

200kΩ
C

40kΩ
D

2kΩ

Solution

$A p p l y K V L i n l e f t l o o p, V_{b} = I_{b} R_{b}$
$R_{b} = \frac{V_{b}}{I_{b}} = \frac{10}{25 \times 10^{- 6}} = 400 \times 10^{3} Ω = 400 k Ω$

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