Electrical Principles, what happens when a Capacitor is connected to an AC or DC supply, how are they made. What is power factor? How can they use no power? Phasor Diagrams. Calculate the current flow with a capacitor, Xc calculation. Application of calculations. For all electrical students and those that just want to know or re-remember. Ideal for level 2 or level 3 electrical students - for that up and coming electrical exam. Xc=1/(2PifC). Measure and calculate the power in a capacitor - yes it is practically Zero Watts - don't believe me just look.