First slide

Transistor

Question

In a silicon transistor, the base current is changed by 20 $μ$ A. This results in a change of 0.02 V in base to emitter voltage and a change of 2 mA in the collector current. The transistor is used as an amplifier with the load resistance of 5 k $Ω$ . The change in output voltage across load is

Moderate

A

20 V
B

10 V
C

100 v
D

5 V

Solution

Input resistance $R_{in} = \frac{0 .02}{20 \times 10^{- 6}} = \frac{2 \times 10^{4}}{20} Ω = 10^{3} Ω$
Change in output across load = 5000 x 0.002 V = 10 V

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