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It is essential for students to have a switch to use in experiments, both to prevent the premature demise of batteries (and believe me, students will roast batteries frequently if allowed) and for safety reasons. Short circuits get hot, even with small batteries. This switch is easy to make and I insist that ALL circuits the students build use it. Obtain some ½" copper strips, around 16 gauge. I get mine donated by a local sheet metal shop, where they cut them out of scraps for me. Cut a piece 3-4" long, and drill a 1/16" hole in one end. If you don't have a drill handy, a hole can be punched with a hammer and nail. Mount the copper strip onto a piece of wood with a thumbtack. Use another thumbtack to hold down a paper clip to make the contact. Bend the paper clip as shown in the picture for easy connection of alligator clips.
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The Hydrogen Fuel Cell
Electronics Stuff
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