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In a mains power transformer, the primary winding has 250 turns, and the secondary has 500. If the input voltage is 120 volts, the likely secondary voltage is:
240 V
The voltage ratio is equal to the turns ratio: V_sec / V_pri = N_sec / N_pri. V_sec = V_pri * (N_sec / N_pri) = 120 V * (500 / 250) = 120 V * 2 = 240 V.
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