1.

Applying Kirchhoff's laws to different loops in Fig. find the values of V1 and V2.

Answer»

Starting from point A and applying Kirchhoff's voltage law to loop No.3, we get

- V3+ 5 = 0 or V3 = 5 V

Starting from point A and applying Kirchhoff's voltage law to loop No.1, we get 

10 - 30 - V, + 5 =0 or V, =-15 V 

The negative sign of V, denotes that its polarity is opposite to that shown in the figure. 

Starting from point B in loop No.3, we get 

-(-15) - V2 + (-15) = 0 or V= 0



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