An ideal transformer has 50 turns on the primary and 150 turns on the secondary, with 100 V on the primary. What is the secondary voltage?

Answer and explanation

Correct answer: B. 300 V

  1. Step 1: For an ideal transformer Vs / Vp = Ns / Np.
  2. Step 2: Vs = 100 x 150 / 50 = 300 V.
Answer
300 V.
Why not the others: '33.33 V' inverts the turns ratio; '400 V' uses the total number of turns Np + Ns in the numerator; '15000 V' forgets to divide by the primary turns.

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