Thanks, tractorman. Actually I learened that stuff in tech school. We had one heck of an instructor!
Well you almost got it… the part about making and breaking getting excessive current doesn’t add up the way you may think. You’re basically correct about the current and magnetic field, but you have to recall that a changing magnetic field will induce current in a conductor. When you make and break, the magnetic field builds and decays as you make and break. The decaying field induces a “reverse voltage” which “pushes” the current back- (this is what almost killed B.L.E with his scrap metal magnet) Remember that voltage is simply the pressure pushing the electrons making the current. The net result is that the current will not grow and grow as you continue to make and break - if you can get it to do that - you’ll be a billionaire as you will have just solved the worlds energy needs!
In a simple DC circuit with a 12 volt battery source you are not going to get a spike over 12 volts
The wiring and circuits have an L component to them. The connection bounces as you make the contact. This produces a pulsed DC and the L component makes the spikes. This is why you see a diode used across a DC relay coil. It’s a DC circuit, right? But the inductive kick is quite substantial when the current stops flowing. Just an example to help illustrate my point…