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The core is a continuous loop because it provides a continuous path for the magnetic field and therefore helps to prevent magnetic flux losses.
The core is laminated to reduce power loss in the core due to eddy current.
According to Faraday’s law, the induced e.m.f. is proportional to the rate of change of the magnetic flux linkage.
In a transformer, the changing current in the primary coil gives rise to a changing magnetic flux in the core. This changing magnetic flux links with the secondary coil and induces e.m.f. in it.
The advantages of using alternating voltages for the transmission and use of electrical energy include:
Easy or efficient change of voltage
Reduction of power loss when transmitting at a high voltage.
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