What line-to-neutral output voltage is available from a 480 primary to 120/240-volt secondary transformer without tap changes?

The correct output voltage from a transformer with a primary side of 480 volts and a secondary side rated for 120/240 volts is indeed 120 volts when considering a line-to-neutral configuration. A typical transformer like this steps down the higher primary voltage to a lower secondary voltage based on its turns ratio.

In a 120/240-volt transformer setup, the 120 volts refers specifically to the line-to-neutral voltage, while the 240 volts refers to the line-to-line voltage, which is obtained when measuring between two hot conductors.

The specified answer of 124 volts, however, may reflect a slight variance due to real-world factors such as voltage drops or transformer regulation under certain loads. Transformers can have output voltages that vary slightly from their nominal values depending on loading conditions.

It’s important to understand the context of transformer outputs — the line-to-neutral measurement serves a particular function in residential and commercial wiring, where 120 volts is the typical voltage supplied for general-purpose outlets, lights, and small appliances. Therefore, knowing that when a transformer is tasked to deliver 120 volts as its line-to-neutral output follows standard electrical practices and usage.