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Place the coil on the transformer and weld together two nails!
A very illustrative experiment.
Use a 230V/600-winding coil as a primary coil and a 6-winding coil as a secondary coil. The secondary coil provides so much current strength that it is possible to anneal a nail or weld together two nails.
Material: Coil made of copper, shaft made of wood.
Suitable nail: 75 mm non-galvanised, not supplied.
Dimensions: Length 23 cm, inner diameter 58 mm.