Question

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

• A. 60
• B. 50
• C. 65
• D. 45
• E. 55

Answer 1

The correct option is E 55

By step-down transfer, it converts a high voltage of low current into a low voltage of high current.
Using $\frac{N_S}{N_P}=\frac{I_P}{I_S}$
Or $\frac{N_S}{330}=\frac{4}{24}$
We get $N_S=\frac{4\times 330}{24}=\frac{330}{6}=55$