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Joule Heating: How a Resistor Turns Current into Heat

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Joule heating in a resistor — every charge crossing a resistor drops potential V·q which becomes heat; instantaneous power P = V·I = I²R = V²/R; total dissipated energy W = P·t accumulates linearly while the current flows

Joule heatingpower dissipationOhm's lawI²R lossenergy
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