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Transformers - Engineering

Q1:

A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?

A 7.3 V

B 73 V

C 88 V

D 880 V

ANS:A - 7.3 V

Given Data:

1. Primary Voltage: 110V.
2. Turns ratio: 15:1 (15=Primary turns, 1=Secondary Turns).

V1/V2 = N1/N2.
110/V2 = 15/1.
110*1/ 15 = V2.
Hence V2 = 7.3V across transformer secondary winding.

Now, load is of 120Ohm connected across the secondary winding.

So, the load will face the same secondary voltage.