Household current, or AC voltage, is the most common form of electricity used in homes throughout the world. It is a type of alternating current electricity, meaning it fluctuates or alternates between two levels of voltage. Specifically, the voltage of standard household current in the U.S. is 120 volts (V) or 240 V.
The difference between 120 V and 240 V is where they are used. The lower voltage is used in households for most electrical appliances and lighting fixtures. This voltage is used for small devices such as kitchen appliances, washers and dryers, TVs, computers, and cell phones. Common residential ground-fault circuit interrupter outlets — often seen in kitchens, bathrooms, and outdoors — are rated for 120 V and 15 A of current. Some larger appliances, such as stoves, ovens, dryers, and water heaters, require more power and use 240 V outlets.
While 120 V and 240 V are the most common forms of household current, there are other voltage options available. In industrial or commercial settings, higher voltages of 277/480 V and 600 V are often used for large motors and other specialized equipment. In some areas where natural gas is not available, other high-voltage lines deliver electric power – usually in amounts greater than 120 V and 240 V. Regardless of where they’re used, all of these voltages are important parts of running any household.
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