The copper strip that connects to the live wire on an electric kettle is typically the terminal that is marked with a "L" or "Live" label. This terminal is designed to receive the live wire from the power source, which carries the electrical current that heats the kettle. The reason for this specific connection is rooted in electrical safety and the design of the kettle's heating element.

Electric kettles are designed to operate at a specific voltage, usually 120V in the United States. The live wire carries the ungrounded current, which is necessary for the kettle's heating element to function. The copper strip is chosen for its excellent conductivity, which ensures that the electrical current is efficiently transferred from the power source to the kettle's heating element without significant loss of energy.

According to the National Electrical Code (NEC), which is the standard for electrical installations in the United States, copper is the preferred material for electrical wiring due to its high conductivity and durability. The American Wire Gauge (AWG) system specifies the size of the copper wire, with smaller numbers indicating thicker wires. In the case of electric kettles, the wire gauge is typically small, such as 18AWG, which is sufficient for the current requirements of the kettle.

The connection between the live wire and the copper strip is made using a screw terminal or a spring clamp, which ensures a secure and reliable electrical connection. This connection is crucial for the safe operation of the kettle, as any loose or faulty connections could lead to electrical hazards, such as shocks or fires.

In summary, the copper strip that connects to the live wire on an electric kettle is the terminal marked with "L" or "Live," and it is designed to receive the live wire from the power source. This connection is essential for the kettle's operation and is made using high-quality copper wire and secure terminal connections to ensure safety and efficiency.