# Which winding of the transformer has less cross-sectional area?

Which winding of the transformer has less cross-sectional area?

### Right Answer is: High Voltage Winding

#### SOLUTION

• The number of turns on the primary and secondary windings depends upon their respective voltages.
• We know that current density is defined as the ratio of current to perpendicular cross-section area through which current is crossing.
• The value of current density of HV winding is more in comparison to LV winding because of better cooling of HV winding
• Since HV winding is placed far from the core in Comparison to LV winding which is placed near to the core.
• Current density is inversely proportional to the area of the core so the thin wire is used for HV winding.
• Also as the resistance of winding is inversely proportional to the area of cross-section, the area of high voltage winding is less compared to low voltage winding.
• Therefore HV winding has Low cross-sectional area.
• A high-voltage winding has far more turns than a low-voltage winding.
• On the other hand, the current in a high-voltage winding is much smaller, enabling us to use a smaller size conductor.
• The result is that the amount of copper in the primary and secondary windings is about the same.
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