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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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+<br />

_<br />

V1<br />

R1 V 2 V3<br />

I1 I2 I3<br />

V R2 R3<br />

Since, V2=V3, we find from the above relations<br />

I2*R2 = I3*R3<br />

⇒ I3 = I2. R2 /R3<br />

Substituting this value of I3 in the constraint I1 = I2+I3, we find<br />

I2 = I1.R3/(R2+R3).<br />

Fig. 19.3: A more complex circuit.<br />

We may thus use only the following constraints to find the value<br />

of I1.<br />

V = V1+V2<br />

V1 = I1*R1<br />

V2 = I2*R2<br />

I2 = I1.R3 / (R2+R3).<br />

However, if we want to find a constraint C’, equivalent to C, we may take C’<br />

as follows,<br />

C’ = (V=V1+V2) ∧ (V1=I1*R1) ∧ (V2=I2*R2) ∧ (V3=I3*R3) ∧<br />

(I1=I2+I3) ∧ (I2=I1.R3 / (R2+R3)).<br />

C’ need not be unique. In fact, we could replace I1=I2+ I3 from the last<br />

expression by I3= I1R2/ (R2+R3).

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