Great work!

Some small bugs, but it seems okay. Keep going!

Oh, and please. The text for the current seems to be to darkly tinted. It's hard to read on the black background. Could it be a good idea to have here a light blue?

Or perhaps more technical colors... during my studies Voltage was ever blue, Current ever red. You could use green for the percentage.
But, thats only colors... not so important.