What does the red light on my grounds mean?

[kzimmer]

2 hours ago, trreed said:

@kzimmer I haven't thought about my engineering physics classes in a good while, and now you've got me having flashbacks to the curl operation and making sure my thumb was facing the right way.

 

Bahahaha, stupid right hand rule vs left hand rule.

15 hours ago, JAG1 said:

So you guys sayin' that you get that from a little iron with everything else non ferrous in the circuit. What about the battery post nuts those are iron. No hurry, but can you explain induction. Thank you I.A.

 

Basically, with the iron nut on your battery, it's just passing current (kind of, its actually just fastening the conductor to the lead post so it isn't really even conducting). There is no induction happening in the area. @trreed pretty much summed it up:

 

2 hours ago, trreed said:

@JAG1, induction is created when current is passed through coil of wire that creates an electromagnetic field.  This field can be used to anneal and heat treat metal, 'inducing' the current into the conductor

 

I think of induction as a transformer with a primary winding, no iron core, and no secondary winding. So... basically just a coil of wire with current flowing through it. So you have all this magnetic flux being generated by current flowing through the coil/winding. This flux wants to go somewhere, it wants to find ferrous metal. It doesn't give a flux, it's going to find some iron. So introduce some iron in the neighborhood, and it's going to get heated. Even with the iron nearby that is the intended receiver of the flux/heat, some stray flux really wont give a flux and it'll find some other iron in the neighborhood... like a nut or hose clamp made of the wrong material.