Begins with CU of flashlight shining into camera then disassembling. CU of small lightbulb with alligator clip, zoom out to reveal battery plugged into lightbulb. Fade to battery standing up on table, hands break it in half and lay the parts on the table as the camera zooms in on the carbon core, the man touches the ammeter probes on each end. MS of man measuring current and CU of ammeter chart responding to the charge. MS of battery and ammeter, zoom into battery and dissolve to animated diagram of battery and circuit. CU of lemon being cut in half. CU of alligator clipped nickels being submerged in the lemon. MS of circuit: the lemon and a galvanometer. CU of galvanometer responding to charge. Fade to black.