1. The problem statement, all variables and given/known data In sinusoidal circuit shown in Figure 13 is known : w =10^6 1/s, R = 100 Ohm , L = 300μH , C1 = 10nF and C2= 5nF . Reactive power of coil inductance L is QL = 3kVAr , RMS value of the voltage receiver impedance Z is UZ = 100 V , and the voltage UZ phase delaying behind electricity generator Ig for pi / 2. Calculate the complex apparent power S of that generator. 2. Relevant equations 3. The attempt at a solution I set current source at angle 0. Ig = Ig exp( j*0) = Ig By compensation theorem , I replaced impendance Z with ideal voltage source Ek =Uz exp(-j*pi/2) = -j100 V From QL = IL^2 * XL , I get IL = sqrt(QL/wL) = sqrt(10) A. Using node voltage method I get result from the picture. The problem is that there are too many unknowns (2 equations and 3 unknowns) , well I got RMS value of IL but I still don't know it's angle. I am pretty stuck at this point.