Electromotive Force and Current – 5E00.00 Electrolysis – 5E20.00 Electrolysis of Water – 5E20.10 Plating – 5E30.00 Cells and Batteries – 5E40.00 Lemonade Battery – 5E40.10 Human Battery – 5E40.20 Thermoelectricity – 5E50.00 Piezoelectricity – 5E60.00