Question

In a common emitter transistor, the current gain is 80. What is the change in collector current, when the change in base current is 250 μA

• A. 80 × 250 μA
• B. (250 – 80) μA
• C. (250 + 80) μA
• D. 250/80 μA

Answer 1

Answer: (A)

80 × 250 μA

Answer 2

Current gain

$\beta = \frac{\Delta i_{c}}{\Delta i_{b}} \Rightarrow \Delta i_{c} = \beta \times \Delta i_{b}$= 80 × 250 μA.