A series connection between primary and secondary windings of a voltage regulator causes the primary to act as part of the secondary winding.

• A. True
• B. False
• C. Not enough information
• D. It depends

Answer: (A)

When windings are connected in series, they carry the same current and voltages add in the loop. That creates an autotransformer-like arrangement, where the windings form a single continuous winding with a tap. In this setup, the primary winding is not isolated from the secondary circuit; it becomes part of the overall secondary winding path. So the primary effectively contributes turns to the secondary, and the voltage seen on the secondary includes the primary portion as well. This is why the statement is true.