Receptacle circuits are electrical systems that provide power to outlets, allowing users to plug in devices like lamps, computers, and appliances. These circuits typically operate on standard voltage levels, such as 120 volts in North America, and are designed to handle a specific amount of current, usually measured in amps. In residential settings, receptacle circuits are often protected by circuit breakers or fuses to prevent overloads and electrical fires. They are usually wired in parallel, ensuring that if one outlet fails, the others remain functional. Proper installation and maintenance are essential for safety and efficiency.