Air Conditioning Repair Certification (ETI) Practice Exam

The standard voltage for residential air conditioning units is typically 240 volts. This voltage level is commonly used because it allows for more efficient operation of larger appliances that require more power, like air conditioning systems. The higher voltage reduces the amount of current flowing through the wires, which minimizes energy losses, allows for smaller wire sizes, and helps manage the heating effects of electrical resistance.

In many residential applications, air conditioning units draw more power than what would be practical at 120 volts, which is primarily used for smaller appliances and lighting circuits in a home. While 480 volts and 360 volts are standard voltages used in commercial and industrial settings, they are not applicable for residential air conditioning systems. Therefore, 240 volts is the correct choice, aligning with the requirements for these types of appliances to operate efficiently and safely in a residential environment.