A step-down transformer is used on a 2.2 kV line to deliv...
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?
20
250
200
500
Correct answer is D
Ep = 2.2kV = 2200V; Es=110V; Ns=25; Np=?
=EpEs = NpNs
= 2200110 = Np25
=110 × Np = 2200 × 25
=Np = 55,000110
∴Np = 500 turns
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