Electrical math

From HwB

Power calculation

Quantity Unit Name
P W Active power
Q var Reactive power
S VA Apparent power

PQS.svg

Power quadrants

PowerQuadrant.svg

Quadrant Phase angle
φ
Current relative to voltage
I 0 to 90° Lagging
II 90 to 180° Lagging
III -180 to -90° Leading
IV -90 to 0° Leading
+P Import Active Power
−P Export Active Power
+Q Import Reactive Power
−Q Export Reactive Power

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