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Knuckle dusters are weapons used in hand to hand fighting. They are made of metal with holes for the four fingers to fit through and it is the bridge across these rings that is used when punching an opponent.
Inside the "holes" are springy brass fingers that grip the plug prongs when you insert the wall plug, making connection with your home's electrical system.
A drill press or a metal drill bit attached to a power drill is commonly used to bore holes in metal. These tools are designed to exert enough force to penetrate through the tough surface of the metal.
Copper is the most common metal used in electrical wires due to its high conductivity and ability to easily carry electrical currents.
A fuse is an electrical safety device that contains a piece of metal that melts when the current flowing through it becomes too strong. This melting of the metal breaks the circuit and prevents overheating of the electrical system.