A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?

A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?
A. 20
B. 250
C. 200
D. 500

Correct Option: Answer is D
Ep = 2.2kV = 2200V; Es=110V; Ns=25; Np=?

=Ep/Es = Np/Ns

= 2200/110 = Np/25

=110 × Np = 2200 × 25

=Np = 55,000/110

∴Np = 500 turns

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