Question

I'm doing a lab on the rate of electrolysis. If my independent variable is voltage, then am I correct to say that I can't control both resistance and the current due to Ohm's Law (V=IR)?

Answer 1

resistance is independent of the current, if you're referring to Ohms law if I remember correctly.

Answer 2

But i thought, according to V=IR, resistance is directly proportional to voltage. So by changing the voltage, I cannot guarantee the same resistance while controlling the current.

Answer 3

the resistance of your cell depends on electrode surface area, distance between electrodes, electrolyte concentration, temperature, and charge carrier mobility

Answer 4

Yea, im going to control those variables too, but when im increasing the voltage (testing the independent variable), i will be increasing the resistance, due to the increased voltage. Won't this affect the fair testing?

Answer 5

so, yeah, If you have ohms law linearly, yeah, a change in voltage will have a change in current

Answer 6

So, is it the increase in voltages that's increasing the rate of electrolysis, or is it the increase in current as the result of voltage increase thats increasing the rate of electroylsis?

Answer 7

increase in current.

Answer 8

Ok thanks very much!

Answer 9

yea