First slide

Transistors

Question

The transfer ratio $β$ of transistor is 50. The input resistance of a transistor when used in CE configuration is $1 k Ω$ . The peak value of the collector A.C current for an A.C input voltage of 0.01V peak is

Moderate

A

$100 μ A$
B

$0.01 m A$
C

$500 μ A$
D

$25 m A$

Solution

$F o r I n p u t S i d e, I_{B} = \frac{V}{R_{1}} = \frac{0.01}{10^{3}} = 10^{- 5} A C u r r e n t G a i n, β = \frac{I_{C}}{I_{B}} \Rightarrow I_{C} = β I_{B} = 50 \times 10^{- 5} A = 500 \times 10^{- 6} A = 500 μ A$

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