- #1

mutineer123

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**I don't understand how to calculate percentage uncertainty!?**

I know in chem we calculate uncertainties by smallest division/the reading X 100. But in physics i am clueless. For instance here's an example

The power loss P in a resistor is calculated using the formula P = V^2/R.

The uncertainty in the potential difference V is 3% and the uncertainty in the resistance R is 2%.

What is the uncertainty in P?

(this is not homework) I just want to know how to get sums like these.