Definition
The rate of flow of electric charge through a conductor, measured in amperes (A) or kiloamperes (kA). In AC transmission systems, current flows sinusoidally at 60 Hz and its magnitude determines how much power is being transferred for a given voltage. High currents cause I²R resistive losses that heat conductors, and every transmission element — lines, transformers, circuit breakers — has a thermal current rating that must not be exceeded to prevent physical damage or reduced equipment life.
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Topic Deck
Electrical Engineering Fundamentals
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Source
FERC Pro Forma OATT / LGIP