In a common base circuit, the current gain is 0.96. If the collector current is 60 μA. Find the emitter current. Answer (62.5 μA)



Given:

Current gain = β =  0.96

Collector Current = IC =  60 μA = 60 ｘ10⁻⁶ A

To Find:

Emitter Current = IE =  ?



Solution:


The Emitter Current IE is the sum of the Base current IB  and collector current IC ie.

IE =  IB  + IC  -----------(1)


Where the base Current IB is unknown and can be found from the Current gain β formula which is 

β = ICIB 

or

IB = ICβ 

putting values

IB = 60ｘ10⁻⁶A0.96

IB = 62.5 ｘ10⁻⁶ A



Now putting the corresponding values in equation (1)

IE =  62.5 ｘ10⁻⁶ A  + 60 ｘ10⁻⁶ A

IE =  122.5 ｘ10⁻⁶ A  

or

IE =  122.5 μA  --------------Ans.

The  answer given in the book is the value of the Base Current IB, So the correct answer for IE  is  122.5 μA 



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