How much current is drawn by the lamp at the outlet? That is, what is the rms current in the primary?

A. \(0.42 \mathrm{~A}\)

B. \(1.3 \mathrm{~A}\)

C. \(4.2 \mathrm{~A}\)

D. \(13 \mathrm{~A}\)

Halogen bulbs have some differences from standard incandescent lightbulbs. They are generally smaller, the filament runs at a higher temperature, and they have a quartz (rather than glass) envelope. They may also operate at lower voltage. Consider a \(12 \mathrm{~V}, 50 \mathrm{~W}\) halogen bulb for use in a desk lamp. The lamp plugs into a \(120 \mathrm{~V}, 60 \mathrm{~Hz}\) outlet, and it hâs a transformer in its base.