why we have the current go through this circuit? I don\'t know why I have this k

Question

why we have the current go through this circuit? I don't know why I have this kvl equations like this? can someone explain for me?
thank you Problem 1.39 Using KVL, we can write 5+20klo +vo _ 5 = 0-1,-10000 From the diode I-V relation, we have Making the initial guess, Vol = 0.5 V, then 1D1-20000 0.5 V, then lol = 10-00-0.475 mA For the 2nd iteration, Vo2 = 0.026|n (fo12 + 1)-0.51945 v 1D2 = 1-0.474 mA 10-12 20000 For the 3rd iteration, VD3 = 0.026|n (-+ 1) = 0.51940 v 1D3 = 10-m = 0.474 mA 20000 Hence, VD = 0.5194 V and ID = 0.474 ma

Explanation / Answer

Here 5 and -5 volts are supply source connected to diode , so current will flow from higher voltage to lower voltage .

So 5 is higher and - 5 is lower .

So it is closed circuit connected between 5 and -5 , so we can apply KVL in that circuit .

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