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A transistor has alpha=0.90, the emitter...

A transistor has `alpha=0.90`, the emitter current is 15mA, what is
(a) The collector current ?
(b) The base current ?
(c) Gain `beta` ?

Text Solution

Verified by Experts

Given `alpha=0.95 ` and `I_(E)=15mA`
(a) as `alpha=(I_(C))/(-I_(E))`
`rArr I_(C)=alphaI_(E)`
`rArr I_(C)=0.95xx15`
`rArr I_(C)=14.25 mA`
(b) As `I_(E)=I_(B)+I_(C)`
`rArr I_(B)=I_(E)-I_(C)`
`rArr I_(B)=15-14.25`
`rArr I_(B)=0.75 mA`
(c) `beta=(alpha)/(1-alpha)`
`rArr beta=0.90/(1-0.90)`
`rArr =0.90/0.10`
`rArr beta=9`
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