Abstract
The transformers considered are those having a continuous iron magnetic circuit of uniform section. Let A be area of section of the core, m and n the number of convolutions of the primary and secondary coils respectively, R, r , and ρ their resistances, ρ being the resistance of the secondary external to the transformer, x and y currents in the two coils, a induction per square centimetre, α the magnetic force, l the length of the magnetic circuit, E = B sin 2π ( t /T), the difference of potentials between the extremities of the primary, T being the periodic time.

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