For a 50-ohm resistive load connected to a wye-delta transformer, what is the phase voltage across the load?

In a wye-delta transformer configuration, the voltage relationships between the wye (star) connections and the delta connections play a critical role in determining the phase voltage across the load. For a typical system with a 480 V line-to-line voltage, the phase voltage can be calculated based on the transformation between the wye and delta connections.

In a wye configuration, the phase voltage (V_phase) is equal to the line-to-neutral voltage, which is derived from the line-to-line voltage (V_line) using the formula:

[ V_{phase} = \frac{V_{line}}{\sqrt{3}} ]

In this scenario, if we consider the line-to-line voltage to be 480 V, the calculation would be as follows:

[ V_{phase} = \frac{480 V}{\sqrt{3}} \approx 277 V ]

This value of 277 V represents the phase voltage across the load connected to the wye configuration of the transformer. Therefore, selecting 277 V as the answer aligns with these calculations and demonstrates an understanding of the relationships and transformation in the wye-delta transformer setup.