五題題目
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唔該x100000

10a)
I=10000/1.5=1.5x10^-4
I(5K resistor)=1.5x10^-4x2=3x10^-4

b)
V=(1.5+3)x10^-4 x 2000=0.9V

c)
Vx=3-0.9-1.5=0.6V
R=0.6 / (4.5x10^-3)=1330

d)
V= 3x {(10000/3)/[(10000/3)+2000]}=1.875V

11a)
28.1 =( 31.7x10^-3 ) R1
R1=886

23.7 =( 35.6x10^-3 ) R2
R2=666

b)
28.1 =( 31.7x10^-3 ) (3+R1)
R1=883

23.7 =( 35.6x10^-3 ) [1/(1/R2+1/30000)]
R2=681

c)
percentage error of R1= [(886-883)/883]x100%=0.340%
percentage error of R2= [(665.7-680./680.8]x100%=2.20%