This experiment is for advanced students. If you’ve attempted the relay and telegraph experiment, you already know it’s one of the hardest ones in this unit, as the gap needs to be *just right* in order for it to work. It’s a super-tricky experiment that can leave you frustrated and losing hope that you’ll ever get the hang of this magnetism thing.
Fear not, young scientist! Here’s a MUCH simpler relay experiment that will actually give a nice blue spark when fired up, along with a nice zap to the hand that touches it in just the right spot. You can also use this relay in your electricity experiments as a switch you can use to turn things on and off using electricity (instead of your fingers moving a switch), including how to make a latching burglar alarm circuit.
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Here is an updated link for a DPDT 12 volt relay: https://www.jameco.com/z/LB2-12DS-R-Rayex-Electronics-DPDT-12A-12V-General-Purpose-Relay-160-Ohm_172719.html
hi aurora! the relay you have selected is no longer available at the web site. Which one can replace it? Thanks!!