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I don't know which node to take as zero voltage. Either C or B or both.

Finding Out I-V characteristic of +V-. Considering Vb = 0.

ASSUMING V IS SOME LOAD

I = I2 - I3

I = ((Va - Vd)/10) - ((Vc - Vb)/10)

I = ((7 - 5)/10) - ((Vc - 0)/10)

I = 0.2 - Vc/10

Where Vc - Vb = V

Considered Vb = 0

So Vc = V

Therefore;

I = 0.2 -V/10

However the Correct Answer is:

I = 0.2 - V/5

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I am getting Correct current (0.2A when V = 0)

But wrong Rth (Thevenin Resistance) as 10 ohms.

Can someone point me where Iam doing wrong in the method IAM using for

calculating I-v characteristic.

I know other shortcuts methods that give me correct answer but I want

to know what mistake I am doing and how to correct it.

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