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Q.
A step down transformer increases the input current $4\, A$ to $24\, A$ at the secondary. If the number of turns in the primary coil is $330$, the number of turns in the secondary coil is
By step-down transformer,
It converts a high voltage of low current into a low voltage of high current.
$\frac{N_{S}}{N_{P}} =\frac{I_{P}}{I_{S}} $
$\frac{N_{S}}{330} =\frac{4}{24} $
$N_{S} =\frac{4 \times 330}{24}=\frac{330}{6}=55$