Transformers must be constructed with the proper ___________ for the system primary voltage and the desired secondary voltage.

• A. Windings
• B. Impedance
• C. Tap changer
• D. Bracket

Answer: (A)

Voltage transformation comes from the turns in the windings. To match a given system primary voltage to the desired secondary voltage, the transformer must be built with windings that have the correct number of turns on each side so the turns ratio sets the output. The secondary voltage is the primary voltage times the ratio of secondary turns to primary turns, so the windings directly determine the voltages you get. Impedance isn’t what defines the fixed voltage levels, though it’s affected by winding design. A tap changer can adjust voltage somewhat under load, but it doesn’t establish the basic voltage relationship. Brackets are just mechanical supports and don’t affect the electrical output.