Power (electric)

The relationship between electric current, resistance, and heat produced per second, was first described in 1840 by James Joule, the independent British brewer/amateur scientist when he was just 22 years of age. Joule showed, by making careful measurements, that the heat produced by an electric current is given by....

In modern terms, the definitions of electric current as charge per second and of voltage as energy per charge lead at once to the simple interpretation of the product VI as energy per second (power).

Applying Ohm's law gives ...

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