I have some problem understanding the concept of the voltage changing across a resistor. Given V=IR (Ohm's Law) Ok so according to Ohm's Law, if I increase the resistance of a circuit, the potential difference of across the resistor will change. I know that potential difference is simply the difference between the potential of 2 position(where it crosses the resistor), so if the potential difference increases as resistance increase, there is only two ways it can be done. Given potential difference V = V1-V2 either V1 increases or V2 decreases will cause the potential difference to increase.So which potential will change, V1 or V2?(and how if relevant) Another thing is, how does the increase in resistance increase the potential difference physically, or does it even happen in reality? I know that resistors work by going against the current flow, but I can't seem to get how the voltage will change.