1. Bring the remaining water from the washing by hand, and measured voltage values with a volt meter. Using the zinc anode is connected to the negative of a volt meter. (Galvanized sheet is cracking of low voltage electron well there is served as the cathode of the circuits) then the copper anode(Copper has a different selection of the electron is not well. There are high voltage, it acts as the anode of the circuit) Integrated circuit that, when connected, and then read the value of voltage and bai save result.