A transformer draws from a mains and supplies at to a load

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

Problem

A transformer draws

5\,\text{A}

from a

220\,\text{V}

mains and supplies

22\,\text{A}

48\,\text{V}

to a load. Neglecting all losses, the efficiency of the transformer is closest to (a)

104\%

(b)

86\%

(c)

96\%

(d)

91\%