The power loss is given by I ^2 R where I is the current and R is the resitance.(adsbygoogle = window.adsbygoogle || []).push({});

I know why these variables are in this equation.

V = I R

P = I V

therefore,

P = I² R

What I don't understand is the practical explanations for this. Why are there two current variables? Are there two currents in the wire? If so then how come?

Thanks for all the efforts in advance

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# Homework Help: I need help understanding the formula Power loss= I^2 R

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