I am currently in high school and will be conducting an experiment looking at the effect of surface area on electroplating. I will be changing the surface area of the Cathode during my experiment but am unsure whether the amp and voltage would be controlled or dependant variables.
Just remember two major rules in electrolytic electrochemistry:
If you fix voltage, current cannot be controlled. This is called constant potential electrolysis
If you fix the current, voltage cannot be controlled. This is called constant current electrolysis
Now your electrolysis cell has resistance:
(i) It will depend on electrolytes
(ii) Surface area of the electrodes
(iii) Distance between the electrodes
So let us know your results and findings. Plot a graph systematically by choosing condition 1 or 2.