Physics

Problem

A torch bulb is rated

3\,\text{V},\;0.3\,\text{A}

. The bulb is to be connected to a

9\,\text{V}

battery so that it glows at its rated conditions. What resistance should be connected in series with the bulb? a)

30\,\Omega

20\,\Omega

7\,\Omega

10\,\Omega