What scenario is least likely to use direct current (DC)?

The scenario involving wall outlets in homes is least likely to use direct current (DC) because conventional household wall outlets typically supply alternating current (AC). AC is preferred for residential power distribution due to its ability to be easily transformed to different voltages, enabling efficient long-distance transmission of electricity. This characteristic makes AC more suitable for the power grid and home wiring systems.

In contrast, battery-powered devices, mobile phones, and portable electronics primarily use DC. Batteries generate DC power, which these devices require for operation. While many of these devices can be charged using AC from wall outlets, they internally convert this AC to DC to recharge the batteries and power the electronics. Thus, choosing wall outlets as the least likely scenario for using DC is accurate, as they primarily deliver AC power.