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## Joule low

####
Joule's
Law

When
a current I is passed through a resistance R, the resulting power P
dissipated in the resistance is equal to the square of the current I
multiplied by the resistance R:

P = I^{2}R

**
By substitution using Ohm's Law for the
corresponding voltage drop V (= IR) across the resistance:
P = V ^{2} / R = VI = I^{2}R**