A transformer with primary turns is connected to a rms mains supply

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

Problem

A transformer with

600

primary turns is connected to a

240\,\text{V}

rms mains supply. The secondary has

60

turns and is connected to a

3\,\Omega

resistive load. If the transformer operates at

90\%

efficiency, calculate the rms current in the primary winding. (a)

0.80\,\text{A}

(b)

8.0\,\text{A}

(c)

0.89\,\text{A}

(d)

0.72\,\text{A}