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The transfromer equation is given by[tex]\frac{Vp}{Vs}[/tex]=[tex]\frac{Np}{Ns}[/tex] for an ideal transformer.

This equation is correct only if there are perfect flux linkage, the resistance of both primary and secondary coil is small and carries negligible current.

The notes mention here if the secondary coil is in open-circuit, the latter requirement about resistance is well met.

However I dont understand how opening the circuit of secondary coil will affect the current in the primary coil. Also if there is no current in the secondary coil, can it produce magnetic field?

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# Transformer concepts (magnetic induction)

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