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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