Im a writing a school report regarding the electric energy and potential of a capacitor. In short: An experiment was carried out where we charged a capacitor, and then decharged it with an electric engine, lifting up a predefined weight. We then measured how high the weight was lifted with different voltages. i then found the effiency of the system by comparing the mechanical energy with the electrical energy.
The second half of the report is then to find the electric potential of the capacitor, but I'm not to strong at electrics, and can't find anything about this in my physics book.
My question is now; how can i find the electric potential of the capacitor?