Nate Electrical Practice Exam 2025 - Free Electrical Practice Questions and Study Guide

The commonly found voltage in residential homes is 120/240 Volts AC. This configuration is standard in North America, where most household electrical systems are designed to provide power at these voltages. The 120 Volts AC is typically used for lighting and small appliances, while the 240 Volts AC is used for larger appliances such as ovens, dryers, and HVAC systems. This dual voltage system allows for flexibility in the types of appliances that can be used throughout the home.

In contrast, 24 Volts AC is often used in low-voltage applications, such as thermostats or some types of doorbells, but it's not standard for residential power supply. The 480 Volts AC is generally found in industrial settings rather than residential ones, as it is used for larger machinery and commercial equipment. Lastly, while 12 Volts DC is common in automotive applications and low-voltage electronics, it is not typically used for residential power systems where alternating current (AC) at 120/240 Volts is the norm. Therefore, the correct choice effectively represents the standard electrical delivery system in residential environments.