Electrician Family, Dad Teaches Sons about Coils and Contactors, and how they operate, Thoughts?

What's a coil? Do you guys know what a coil is? >> It's a wire that heats up and then it releases. >> Coil is a just a loop of wire, right? >> When you energize a loop of wire, what happens? >> It creates a magnetic field and then that magnetic field will pull against a piece of steel and create a contactor. >> Okay. >> Okay. >> You can take wires around your finger and wrap it and wrap it and wrap it and that's a coil. But obviously there's some engineering to make sure they're sized properly. But that's really all it is. This is actually a lighting contactor. This will control 12 circuits at one time. If a customer said to you, "Hey, I want to be able to open up my front door and turn on one switch and I want the entire warehouse to turn on." What would you do? >> Uh circuitation. >> You would put in a control contacttor. >> Okay. Okay. And the control contacttor would have L1 and T1. Do you know the difference between L1 and T1? >> L1's line T. Correct.