1.

Find the value of the source voltage from the following circuit.(a) 49.2V(b) 34.6V(c) 65.2V(d) 25.6V

Answer» The correct choice is (a) 49.2V

For explanation I would say: I3 =(3+j0)A

V2 =I3R=(3+j0)(8+j0)=(24+j0)V

I2=V2/Xc=(0 + j1.5) A

I1 =I2 +I3 =(0+j1.5)+(3+j0)=(3+j1.5)A

I1=(3^2+1.5^2)^1/2= 3.35A.

V1 =I1(R+jXL) =(15+j30)V

E=V1 +V2 =(39+j30)V

E=(39^2+30^2)^1/2= 49.2V.


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