When voltage taps other than the rated taps are used, the number of turns on that winding is increased or decreased because ___.

When voltage taps other than the rated taps are used, the number of turns on that winding is increased or decreased because ___.

• A. additional coils of wire are connected in series with the main coils
• B. some of the coils of wire are taken out of the series circuit
• C. either a or b
• D. none of the above

Answer: (C)

The main idea here is that the voltage on a winding is determined by how many turns it has. Taps select a portion of those turns, so changing the taps changes the effective number of turns. If you connect additional coils in series with the main winding, the total number of turns increases, which raises the output voltage proportionally. If you remove some coils from the series, the total number of turns decreases, lowering the output voltage. Since both adding and removing turns change the turns count, either method can adjust the voltage, making that option the best choice. The other idea would be that nothing about the turns changes, which isn’t the case here.

The main idea here is that the voltage on a winding is determined by how many turns it has. Taps select a portion of those turns, so changing the taps changes the effective number of turns.

If you connect additional coils in series with the main winding, the total number of turns increases, which raises the output voltage proportionally. If you remove some coils from the series, the total number of turns decreases, lowering the output voltage. Since both adding and removing turns change the turns count, either method can adjust the voltage, making that option the best choice. The other idea would be that nothing about the turns changes, which isn’t the case here.