A distribution transformer supplies an output power of at full load

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A distribution transformer supplies an output power of

4.0\,\text{kW}

at full load. At this load, its copper loss is

100\,\text{W}

and its core (iron) loss is

60\,\text{W}

. Determine the efficiency of the transformer at full load, correct to two significant figures.