An ideal transformer has 100 turns on the primary and 50 turns on the secondary, with 240 V on the primary. What is the secondary voltage?
Answer and explanation
Correct answer: D. 120 V
- Step 1: For an ideal transformer Vs / Vp = Ns / Np.
- Step 2: Vs = 240 x 50 / 100 = 120 V.
Answer
120 V.
Why not the others: '480 V' inverts the turns ratio; '190 V' adds and subtracts the turns; '12000 V' forgets to divide by the primary turns.
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