"120 volts" refers to the standard voltage level used in residential electrical systems in the United States and Canada. This voltage is commonly used to power household appliances, lighting, and electronic devices. It is part of the alternating current (AC) system, which means the electrical current changes direction periodically. In contrast to higher voltages, such as 240 volts, which are often used for larger appliances like dryers and ovens, 120 volts is considered safer for general use. It allows for the efficient operation of everyday items like televisions, computers, and kitchen gadgets without the risk of severe electrical shock.