Equations · equation

Joule Heating

Circuits · 1841

Equation: P = I²·R
Field: Circuits
Named After: James Prescott Joule
Symbols: P power dissipated as heat · I current · R resistance · equivalently P = V·I
Year: 1841

Significance

Current forcing its way through resistance sheds energy as heat — toasters, fuses, and incandescent filaments on purpose; warm laptops and power-line losses by accident. The I² is why the grid transmits at high voltage and low current.

Skills

TIG Welding Stick Welding MIG Welding Crimping and Wire Termination Soldering

Related

Peltier Effect First Law of Thermodynamics

Requires

Ohm's Law Power

Elements

Nickel Chromium Tungsten

Referenced by

element

Chromium Nickel Tungsten

equation

First Law of Thermodynamics Ohm's Law Peltier Effect Power

skill

Crimping and Wire Termination MIG Welding Soldering Stick Welding TIG Welding

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From the Equations database in Notion, last edited 2026-08-18. This page is the row, rendered by the build; nothing on it is written by hand.