The typical voltage found in a residential dwelling is:

The correct choice of 120/240 volts reflects the standard voltage system used in most residential homes in the United States, including Florida. This system delivers 120 volts for most household appliances and lighting, while providing 240 volts for larger appliances such as dryers, ovens, and HVAC equipment. The two voltage levels are achieved through a split-phase electrical system, where the utility service provides two 120-volt lines that, when combined, produce 240 volts.

In contrast, the other options do not accurately represent the typical residential voltage in the U.S. The 220/400 option is more aligned with three-phase systems found in industrial settings rather than residential. The 110/220 option is outdated; while 110 volts was a common reference in the past, current standards have shifted to using 120 volts for safety and efficiency. Finally, 120/120 does not apply to residential setups since it does not account for the necessary voltage differences used to support larger appliances. Thus, 120/240 accurately describes the configuration found in most homes.