What is a center tap in a transformer?

A center tap in a transformer refers to a connection point that is located at the midpoint of the winding. This configuration allows the transformer to produce two voltages from a single winding. Specifically, when you take the center tap and connect it to the ground or a reference point, you create two equal voltages on either side of that tap. Each side will provide half the total voltage of the winding.

For example, if the total voltage of the winding is 240 volts, the center tap will give you two outputs of 120 volts each, one on either side of the center tap. This setup is often used in power supply systems to provide different voltage options, especially in circuits requiring both positive and negative voltage references.

The other options do not accurately describe the function of a center tap in a transformer. Complete voltage output refers to the total voltage of the winding, while reducing current flow does not specifically relate to the purpose of a center tap. Lastly, while voltage surge protection is important in electrical systems, it is not the role of a center tap.