The core of a transformer is laminated so that:
energy losses due to eddy currents may be minimized
the weight of the transformer may be reduced
rusting of the core may be prevented
the ratio of voltage in primary and secondary may be increased
In a transformer, the changing magnetic flux induces small circulating currents called eddy currents in the iron core. These currents produce heat ( loss) and waste energy. To minimize this, the core is laminated, meaning it is made of thin sheets of steel insulated from each other. This increases the resistance to the path of the eddy currents, thereby reducing their magnitude and the consequent energy loss .
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