A distribution transformer delivers to a load

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A distribution transformer delivers

4.0\,\text{kW}

to a load. At this load, the copper loss is

100\,\text{W}

and the core (iron) loss is

60\,\text{W}

. The efficiency of the transformer at this load is (a) 98.5\% (b) 94\% (c) 96\% (d) 92\%