Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Joule heating

Joule heating


Joule heating, also known as ohmic heating and resistive heating, is the process by which the passage of an electric current through a conductor releases heat. The amount of heat released is proportional to the square of the current such that

Q propto I^2 cdot R cdot t

This relationship is known as Joule's first law or Joule–Lenz law.[1] Joule heating is independent of the direction of current, unlike heating due to the Peltier effect.

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