3.20 (c) Determine the equivalent resistance of networks shown in
Fig. 3.31.

(a) 

Answers (1)

It can be seen that in every small loop resistor 1 ohm is in series with another 1 ohm resistor and two 2 ohms are also in series and we have 4 loops,

so equivalent resistance of one loop is equal to the parallel combination of 2 ohms and 4 ohm that is 

Equivalent\ R_{loop}=\frac{2*4}{2+4}=\frac{8}{6}=\frac{4}{3}

now we have 4 such loops in series so, 

Total\ Equivalent\ R_{loop}=\frac{4}{3}+\frac{4}{3}+\frac{4}{3}+\frac{4}{3}=\frac{16}{3}

Hence equivalent resistance of the circuit is 16/3 ohm. 

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