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Convection current is current that is produced when a conductor induces a current in another conductor, and that other conductor is shorted.

An example would be a conductor going through a hole in a metal panel. The hole represents a one-turn transformer that is shorted. Convection current (or eddy current) represents a loss of power and it creates heat.

To avoid this, you either cut a slot in the panel to the hole, breaking the circuit, or you pass symmetrically opposed or balanced conductors through the same hole.

This is also why Transformers are made with stacked plates, plates that are insulated from each other, and that individually do not create a circuit.

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