voltage regulation of transformer?

The change in output voltage from no load to full load defines the voltage
regulation of that transformer.
Voltage regulation is the percent change in output voltage from no load to full load. There is a natural voltage drop internal to a transformer due to the resistance of the copper windings. As more current passes through, more voltage will be dropped across these windings. This results in an uneven voltage output that is dependent upon the current passing through the transformer.

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