Joule's Law
a law which relates to the work done by an electric current in overcoming the resistance in the circuit. It is substantially as follows: In any circuit carrying a current I, in ampères, the heat energy developed, where R is the resistance of the portion of the current under consideration, equals I'R.
This formula expresses, in watts, the activity of that portion of the current. Now the activity of one watt indicates the development of .24 calories of heat each second; consequently a complete expression of the heat set free is H-I2X.24 calories, equal to IEX.24 calories second. See JOULE, J. P. a