CONCEPTS OF POWER IN ALTERNATING CURRENT
SYSTEMS
SYSTEMS
The electric power systems specialist is in many instances more concerned with electric power in the circuit rather than the currents. As the power into an element is basically the product of voltage across and current through it, it seems reasonable to swap the current for power without losing any information in describing the phenomenon. In treating sinusoidal steady-state
behavior of circuits, some further definitions are necessary. To illustrate the concepts, we will use a cosine representation of the waveforms.
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