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

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

### Right Answer is: Low 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 the current density of LV winding is less in comparison to HV winding
• LV winding is placed near to the core in Comparison to HV winding which is placed far from the core.
• Current density is inversely proportional to the area of the core so the thick wire is used for LV winding.
• Also as the resistance of winding is inversely proportional to the area of cross-section, the area of Low voltage winding is high compared to low voltage winding.
• Therefore LV winding has a high cross-sectional area as it carries a higher current compared to high voltage winding
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