Joule's law
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Joule's law (due to James Prescott Joule) expresses the amount of heat generated by an electrical resistor, and is expressed by the relation
- <math>Q \propto I^2 R t<math>
by current <math>I<math> flowing through a resistor with resistance <math>R<math> for a time <math>t<math>, and <math>Q<math> is the heat generated
or
- <math>Q = k I^2 R t<math>
where <math>k<math> is the constant of proportionality, dependent on the units used to express <math>I<math>, <math>R<math> and <math>t<math>. If amperes, ohms, and seconds are used, and the result expressed in joules, it is simply 1.
- <math>units = J / A^2 \Omega s<math>
See also: Peltier-Seebeck effect