What is the frequency of electrical systems used in most household appliances in the US?

What is the frequency of electrical systems used in most household appliances in the US?

• A. 120Hz
• B. 60Hz
• C. 50Hz
• D. 30Hz

Answer: (B)

The frequency of electrical systems used in most household appliances in the United States is 60Hz. This frequency is standard for residential electrical systems and is regulated by the National Electrical Manufacturers Association (NEMA). The choice of 60Hz allows for efficient operation of a variety of appliances and electrical devices, including refrigerators, air conditioners, and lighting systems. The use of 60Hz has historical roots, as it was adopted as the standard frequency for alternating current in the early 20th century, taking into account the balance between efficiency and the need for a stable power supply. In contrast, 50Hz is commonly used in many other countries, which can affect the compatibility of appliances when traveling or importing goods. Frequencies like 120Hz and 30Hz are not standard for household use, as they would lead to inefficiencies in the operation of motors and other electrical components typically found in home appliances.

The frequency of electrical systems used in most household appliances in the United States is 60Hz. This frequency is standard for residential electrical systems and is regulated by the National Electrical Manufacturers Association (NEMA).

The choice of 60Hz allows for efficient operation of a variety of appliances and electrical devices, including refrigerators, air conditioners, and lighting systems. The use of 60Hz has historical roots, as it was adopted as the standard frequency for alternating current in the early 20th century, taking into account the balance between efficiency and the need for a stable power supply.

In contrast, 50Hz is commonly used in many other countries, which can affect the compatibility of appliances when traveling or importing goods. Frequencies like 120Hz and 30Hz are not standard for household use, as they would lead to inefficiencies in the operation of motors and other electrical components typically found in home appliances.