why are thick wires used in secondary coil in step down transformer?
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The reason for making the secondary windings thicker is, while working on a transformer, AC current will be passing through both windings. These coils will be having a resistance and due to heating there will be energy loss. This loss can be reduced by using wires with lower resistance for winding. The voltage will be higher in the secondary coil so there is a chance for more loss. So, to reduce the temperature we use thicker wires having low resistivity.
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