4.3 Voltage and Current Capacity of Cells The e.m.f. of a cell depends on the materials of its electrodes and the electrolyte. On the other hand, the amount of current an electric cell can produce in a given span of time depends on the quality of electrodes and the electrolyte it is made of. The table below shows the e.m.f. of some electric cells and the materials they are made of. Cell e.m.f. Positive Electrode Negative Electrode Electrolyte 1 Simple cell (Zinc-acid) 1.5 Copper Zinc Dilute sulphuric acid 2 Leclanché 1.5 Carbon Zinc Sal ammoniac 3 Mercury 1.35 Steel Zinc Potassium hydroxide 4 Silver oxide 1.5 Silver oxide Zinc potassium or sodium hydroxide 5 Zinc air 1.4 Oxygen gas Zinc potassium hydroxide 6 Lithium air 3.8 Oxygen gas Lithium Organic carbonate 7 Lead-acid 2.2 Lead dioxide Lead Dilute sulphuric acid 8 Nickel-cadmium...