but they generate electricity when their coil vibrates. Copper wires carry those impulses from one cup to another. We haven’t heard of anyone making a tin can phone amplifier, but the strictly ...

Neodymium magnets are very strong so you'll need an adult to help you. Image caption, STEP 1 - COIL WIRE ... This vibrates the cup, making sound!

in this one the coil is made to be the static side of an actuator. Attached to the circuit with folding arms is a stack of two permanent magnets, which work as the moving part. Since the magnets ...