Determine the current through each of the specified points.
R2 , R3 , R4 , R5 are in parallel
1/R2345 = 1/R2 + 1/R3 + 1/R4 + 1/R5
1/R2345 = 1/782 + 1/463 + 1/334 + 1/365
R2345 = 109 ohm
R1 , R2345 are in series
Rtot = R1 + R2345
Rtot = 711 + 109 = 820 ohms
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IE = V/Rtot = 15/820 = 18.3 mA
I2 = IE*R2345/R2 = 18.3*109/782 = 2.55 mA
I3 = V2345/R3 = IE*R2345/R3 = 18.3*109/463 = 4.32
mA
I4 = V2345/R4 = IE*R2345/R4 = 18.3*109/334 = 5.97 mA
I5 = V2345/R5 = IE*R2345/R54 = 18.3*109/365 = 5.46 mA
IB = I2 + I3 = 7.87 mA
<<<---answer
IF = I3 + I4 + I5
IF = 4.32 + 5.97 + 5.46 = 17.75 mA <<<<---answer
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