Physics

Problem

A portable device operates on a

9.0\,\text{V}

battery that stores

5.0\,\text{kJ}

of energy when fully charged. The device draws a steady current of

0.20\,\text{A}

. Approximately how long can the device run before the battery is completely discharged? a)

7.7\,\text{min}

2.8\,\text{h}

46\,\text{min}

23\,\text{min}