Instantaneous power is the rate at which electrical energy is transferred or converted at a specific moment in time. It is calculated as the product of voltage and current at that exact instant, expressed mathematically as $P(t) = V(t) \cdot I(t)$, where $P$ is power, $V$ is voltage, and $I$ is current. Understanding instantaneous power is crucial for analyzing energy flow in electrical systems, especially in transmission lines where voltage and current can vary significantly over time.
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