If a current of 40 mA flows through a series circuit consisting of a 0.4 µF capacitor and a resistor in series with a 4 kHz, 40 Vac source, what is the total circuit impedance?
Impedance of capacitor is
From Ohm's Law
Hence from Pythagoras and the impedance diagram,
From this same impedance diagram we get that the angle of the total impedance is