- #1

pvshackguy

- 10

- 0

Assume an AC voltage at zero degrees applied to an ideal parallel RLC circuit.

For a predominantly inductive circuit, the vector diagram for current should show the supply current in the fourth quadrant (i.e. with lagging phase angle). Reduced to a triangle representation, it would be "hanging down" from the horizontal.

Now if I wanted to draw corresponding triangles for the circuit admittance and power, what would their orientations be? I have a guess but I'm not keen to embarrass myself in such company. (I really wish I hadn't just shipped my forty-year-old notes and textbooks ahead of me in advance of a move.)

Follow-up question: while digging through the net on this subject with mixed results, I ran across reference to reactances "sinking or sourcing VARs." I don't ever recall using these terms. I understand the opposite phase relationship yielding net reactive power, but sink vs. source?