P = I² R Watt
g. ff formula ekrtmjsita
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All these are the formulas of power. But as you can see that in one of the formula P is directly proportional to R and in other it is inversely proportional to R.
V^2/R is used when the potential in the circuit is same. i.e. if the two resistance are connected parallel then we will use V^2/R to calculate the power.
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