Electrical Engineering › Section L · Power (ac) and resonance › Topic L.2
The power triangle and total P, Q, and S
Real, reactive and apparent power fit together as the sides of a right triangle. Draw it once and you can total the power of a whole building, find its power factor and work out the supply current without solving the circuit.
In this topic
- Three powers on one diagram
- Reading the triangle
- Where the triangle comes from
- Complex power from phasors
- Worked example: a series R-L-C circuit
- Totals for a whole system
- Worked example: three loads on one supply
- The supply current
- From a rating to an impedance
- Common mistakes to avoid
- Key takeaways
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