Is the statement "The fuse link is so sized that the heat created by the normal flow of voltage through it is not sufficient to fuse or melt the metal" true or false?

The statement regarding the sizing of a fuse link is indeed false. A fuse is designed to protect electrical circuits from excessive current flow that could lead to overheating and potential damage. The sizing of a fuse link ensures that it can handle normal operating currents without melting. However, when the current exceeds this normal level—due to a fault or overload—the heat generated in the fuse link reaches a critical point that causes the metal to melt and break the circuit.

The key function of a fuse is to act as a safety device that interrupts the flow of electricity when the current exceeds a safe threshold, which is inherently tied to its sizing and material properties. A correctly sized fuse will not melt under normal operating conditions but will melt when an overload occurs, thereby protecting the rest of the electrical system. Therefore, the idea that the normal flow of voltage through a correctly sized fuse link would not create sufficient heat to melt it aligns with its purpose, but the statement in question does not accurately reflect how the fuse operates under overload conditions.