Calculating the voltage drop in AC circuit
1 Substitute current source with it's output impedance. Ideally it is
infinite, so leave it open.
2 Calculate currents and voltages due to voltage source.
3 Substitute voltage source with it's output impedance, Ideally,
zero, so replace it with a short circuit to ground.
4 Calculate currents and voltages due to current source.  (Hint: it is DC, so what does that mean for the capacitor?)
5 Add Corresponding currents and voltages from step 2 and 4.


Where is the top resistor connected to? It seems to float. If it is not connected at the other side, it has no function in this diagram.