Question

A transistor having α = 0.8 is connected in a common emitter configuration. When the base current changes by 6 mA, the change in collector current is ______ 

Options

• 24 mA

• 0.66 mA

• 1.5 mA

• 12 mA

Answer 1

A transistor having α = 0.8 is connected in a common emitter configuration. When the base current changes by 6 mA, the change in collector current are 24 mA.

Explanation:

α = 0.8

`(DeltaI_c)/(DeltaI_b) = beta = alpha/(1 - alpha)`

 = `0.8/(1 - 0.8) = 0.8/0.2 = 4`

∴ `DeltaI_c = 4 xx DeltaI_p`

= `4 xx 6 = 24` mA