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Find VE and IE for the circuit given below
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Answer:

Given : RB=270kΩ,RE=1.5kΩ,VEE=5V,β=100

To Find: VE=?,IE=?

Solution:

Applying Kirchhoff's voltage law to the input circuit of the above figure, will result in

IBRBVBEIERE+VEE=0

but  IE=(β+1)IB

and  VEEVBE(β+1)IBREIBRB=0

with    IB=VEEVBERB+(β+1)RE.....(1)

Substituting values to the equation (1) yields,

IB=5V0.7V270kΩ+(101)(1.5kΩ)

     =4.3V270kΩ+151.5kΩ=4.3V421.5kΩ

     =10.2μA

Hence,

IE=(β+1)IB=(101)(10.2μA)

     =1.03mA

VE=IERE=(1.03mA)(1.5kΩ)=1.545V

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