Ideal power equation of Transformer

Ideal power equation of Transformer

Ideal power equation of the Transformer

(The ideal transformer as a circuit element)

If the secondary coil is attached to a load that allows current to flow, electrical power is transmitted from the primary circuit to the secondary circuit. Ideally, the transformer is perfectly efficient. All the incoming energy is transformed from the primary circuit to the magnetic field and into the secondary circuit. If this condition is met, (i.e, in Ideal transformer) the input electric power must equal the output power:

Ideal power equation of Transformer

giving the ideal transformer equation:Ideal power equation of Transformer

Transformers normally have high efficiency, so this formula is a reasonable approximation.

If the voltage is increased, then the current is decreased by the same factor. The impedance in one circuit is transformed by the square of the turns ratio. For example, if an impedance Zs is attached across the terminals of the secondary coil, it appears to the primary circuit to have an impedance of (Np/Ns)2Zs. This relationship is reciprocal, so that the impedance Zp of the primary circuit appears to the secondary to be (Ns/Np)2Zp.

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  1. Very interesting post. Thank you!

  2. Anonymous says:

    In the eqn we use induced emf in primary coil, how is it equal to the supplied emf in primary coil?

    1. Electrical Technology says:

      In Ideal Transformer<br />Vp=Vs<br />Ip=Is<br />and<br />Pin=Pout

  3. Anonymous says:

    Is P inconing =rated power in a ideal transformer<br />

    1. Electrical Technology says:

      ya sure..

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