Key Factors: Factors that will affect my experiment are depth, distance between electrolytes, voltage, and size of electrodes, concentration and temperature.
My only variable will be the electrodes. I will keep the same all the others. I will attach the electrodes at a fixed distance on a splint this way they will not move so my results will be fair. I will be able to keep the voltage the same at 4V but not changing it on the power pack. I will use thwe same electrodes through the experiment, this way im not changing the size, but I will clean them before every repeat. I will use the same copper sulphate solution so I will not change the concentration. I will try and keep the experiment at room temperature, all doors and window will be closed and the heating off, this way the temperature should not change enough to affect the experiment in any significant way.
If I increase the distance between electrodes the current will fall. If I increase temperature, size, depth, concentration or voltage the current will increase.
Results From my original results I can see that I need to make an adjustments to my set up or the electrodes can move, this way my results aren’t valid.
Once I had made the adjustments I took my real results.
I can see form the tables that as I increase the depth of the electrolyte the current increases. It increases at a steady rate. As shown on my graph it is a near to straight line. This shows me that there is a directly proportional relationship. My prediction was correct, as I doubled the depth the current doubled too.
Evaluation. I did not recognize any anomalous results; this is probably because I only had one variable and nothing else changed.
The line was easy to draw as it was nearly straight and passed through the origin. If I were to repeat the experiment I would to 5 repeats to make my results more valid. If I wanted to do an extension to my work . I could change the shape of the electrode, which would again change the surface area, so I could have flat electrodes instead of round ones. My results and graph still support my prediction.
