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717richboy's avatar

How do I use Ohm's law to show that power can be expressed by the equation P=I^2R?

Asked by 717richboy (234points) May 16th, 2013

Really confused by this physical science question.

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3 Answers

Mariah's avatar

Are you allowed to also use the relationship that P=IV? Because given that equation, it is then just a matter of simple replacement. V=IR (Ohm’s law), so replace the V in the first equation with IR to get P=I^2R.

Strauss's avatar

@Mariah, you are absolutely correct!

I learned Ohm’s law many years ago using “E” instead of “V”. P=IE and E=IR, therefore P=I(IR)=I^2R

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