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//chapter9
//example9.4
//page146
V=10 // V
V_D1=0.7 // V
V_D2=0.7 // V
R=48 // ohm
R_D1=1 // ohm
R_D2=1 // ohm
// D1 and D3 are forward biased while D2 and D4 are reverse biased thus
V_net=V-V_D1-V_D2
R_t=R_D1+R+R_D2
I=V_net/R_t
printf("circuit current = %.3f mA \n",I*1000)
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