Which connection type is correct for supplying voltage to a 120-volt load using secondary transformer configurations?

The connection type used for supplying voltage to a 120-volt load using secondary transformer configurations typically relies on the appropriate phasing and winding arrangements. The answer indicates that the configuration represented by choice B is the one that can effectively deliver the required 120 volts to the load.

In many secondary transformer configurations, particularly when talking about step-down transformers, there are specific configurations that allow for the desired voltage output. For instance, a center-tap transformer can provide 120 volts between each end of the secondary winding and the center tap, making it suitable for standard household applications in North America.

The correct choice represents the transformer winding arrangement that achieves this configuration, ensuring that the output voltage is both stable and suitable for typical electrical loads. The specific attributes of this configuration would include proper balancing and phase alignment to maintain voltage integrity and ensure safety in the electrical system.

By selecting this connection type, electricians can ensure that the 120-volt load is adequately powered without risk of under-voltage or exceeding the voltage rating, it is paramount for the operation of electrical appliances and equipment designed for standard household use.