All the power (watts) in a circuit is dissipated in the circuit resistance.
The purely inductive part of the circuit consumes no power, it only
provides a magnetic field.
Consider the circuit shown in Diagram 23. We have already seen the
phasor diagram of the voltage in the circuit and developed a voltage
triangle from it. This time we multiply the voltage by the common
current (Diagram 24).
Diagram 24
But voltage χ current = power. Therefore the triangle becomes as
shown in Diagram 25.
This is called the power triangle but as the inductive part of the
circuit consumes no power, it is called the wattless component ...
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