A choke coil is needed to operate an arc lamp at (rms) and

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

Problem

A choke coil is needed to operate an arc lamp at

160\text{ V}

(rms) and

50\text{ Hz}

. The lamp has an effective resistance of

5\,\Omega

when running at

10\text{ A}

(rms). Calculate the inductance of the choke coil. If the same arc lamp is to be operated on

160\text{ V}

(dc), what additional resistance is required? Compare the power losses in both cases.