Get it simple and the bare essentials, then show how to vary and calculate

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My Comments: Get it simple and the bare essentials, then show how to vary and calculate

If you add a coil of wire, it makes a shocker. I took old transformer wire, and a bit of sheet metal or cans, and a nail and made ones that would fit in a small matchbox. 1966. I keep that memory because it reminds me that precision can come from care in making things and small adjustments and skill. I also took very fine wire from audio transformers, straight pins (sewing) and made relays. It was possible to make computer circuits, adders and logic circuits. Before transistors relays were used a lot. The telephone company used relays. Be careful when you make videos that you do not become a salesperson or promoter for companies who make things. They learn to do something people cannot, then they keep doing it. They have no incentive to share, to innovate, to change, to let others change. It seems right and is oft promoted, but it often leads to stagnation and dumbing down. You did not draw the circuit diagram. Just words and pictures, and misdirection so your magic is more powerful. You do not need a magnet, just the magnetic field attracting metal. Get it simple and the bare essentials.