Science, Tech, Math › Science Human Battery Demonstration Share Flipboard Email Print Westend61 / Getty Images Science Chemistry Projects & Experiments Basics Chemical Laws Molecules Periodic Table Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated November 18, 2019 Make a human battery by substituting fingers for the salt bridge in a galvanic cell. You can make a human battery with one person, a group of people, or even a thousand people. This is a simple yet impressive electrochemistry demonstration. Make a Human Battery The usual method of connecting the half-cells of a galvanic cell is to use a salt bridge as a source of mobile ions, like in this diagram. However, you can use your fingers in place of the salt bridge. Make a 'V' with two fingers of your hand. Simply dip one finger in the beaker of copper metal in 1M copper sulfate solution and another finger in the beaker of zinc metal in a 1M zinc sulfate solution. You just made a battery out of yourself! Your human battery will have about the same voltage as the standard cell potential. Rinse your fingers when you are done and congratulate yourself on being such an excellent source of ions. Advanced Human Battery Do you want more voltage? Switch out the zinc for a more reactive metal and get your friends in on the action. You can make a sodium-copper battery by having one lucky volunteer touch a small piece of sodium metal. Have the next person join hands with the person touching the sodium. Make a chain of human hands with as many people as you have available (the record for this type of human battery is said to be 1500 people) and have the person on the end dip his or her finger into the copper sulfate solution. Your human battery should deliver about 3 volts. Sodium metal is extremely reactive. Be sure to keep the sodium metal far away from any liquid water and have the person who touched the metal rinse his hand with a vinegar solution following the demonstration.