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V proportional to I or I proportional to V in Ohm’s Law?

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Why we used I proportional to V?
Can we write V proportional to I also?

 

Answer:

Both are ok. If we are changing the current and observing the voltage, then it is V∝ I

If we are changing the voltage and observing the current, then

I∝ V

In general, we write

the dependent variable proportional to the independent variable

dependent variable  = the quantity measured by us

independent variable = the quantity fixed by us

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