Physics

Problem

An electric appliance has a resistance of

30\,\Omega

and is designed to operate at

120\,\text{V}

. It is to be connected to a

240\,\text{V}

mains supply. What resistance should be connected in series with the appliance so that it continues to draw its rated current? a)

60\,\Omega

90\,\Omega

30\,\Omega

15\,\Omega