Quote:
Originally Posted by UFO
Please explain how capacitance causes loss. Capacitance is merely energy storage, it's resistance that causes loss. Yes, RMS losses for the same voltage level are slightly higher, but you have to look at the system as a whole, and it is far less efficient to boost line voltage to 110kV as DC than AC.
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A capacitor has a resistance (real word is impedance) to an AC waveform. Impedance of a capacitor goes down as frequency goes up.
Longer: If this was a DC voltage, the capacitor would draw current when connected and the current would decrease. If you flip the capacitor around 120 times a second, the DC voltage would have to charge the capacitor 60 times from fully negatively charged to fully positively back to fully negative.
An AC circuit.
May seem like sorcery, but that just explains why every electrical engineer I've ever seen has a beard.