Definition
The fundamental circuit relationship V = I × Z (or V = IR for purely resistive DC circuits) governing voltage (V), current (I), and impedance (Z) in electrical circuits. In AC transmission systems, Ohm's Law is applied using complex phasor quantities: the voltage drop across a line segment equals the current times the complex impedance (R + jX). This relationship underlies all circuit analysis: increasing current through the same impedance creates more voltage drop (driving voltage problems at distant load buses) and more I²R losses — the core trade-off in transmission voltage selection and line loading decisions.
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Topic Deck
Electrical Engineering Fundamentals
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Source
FERC Pro Forma OATT / LGIP