A step-up transformer has turns and turns

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

Problem

A step-up transformer has

N_p = 200

turns and

N_s = 2000

turns. The resistances of the windings are

R_p = 0.4\,\Omega

and

R_s = 4.0\,\Omega

. Determine the maximum primary current that will keep the total copper loss within

100\,\text{W}

. (a)

16\,\text{A}

(b)

5.0\,\text{A}

(c)

15\,\text{A}

(d)

11\,\text{A}