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Hi everyone I am new here. Decided to join this forum after reading some posts. So excited to take part in healthy discussions. I have own my original M10 for 3 years now, since earlier this year when I took out my M10 from the bag when I rotate the lens (CV Nokton 40/1,2), the rangefinder...

How do you use a Variable Resistor to determine values to show the relationship between I and V? When you are changing the resistance, I thought you only change the current, since the p.d. is fixed? (assuming negligible internal resistance)