Potential Demonstrator - High school physics to study electrical phenomena such as potential, potential difference, and equipotential surfaces Put the pre-drilled white paper, carbon paper, and conductive paper into the screw in turn, and lay them flat on the plastic plate. Use two wiring forks to connect to the two electrodes of the instrument respectively, and tighten the nuts so that the electrodes are pressed against the conductive wire with a certain pressure. Connect the other ends of the wiring fork to the power supply DC6V, so that the experiment can be carried out.