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A fuse is an electrical device that protects electrical cables, equipment, components and circuitry from damage caused by excessive current. The fuse acts as the weakest point in the circuit. As electric current passes through the fuse, the increasing electrical resistance of the fuse conductor causes a voltage drop and power loss in the form of heat. When the fuse "blows," it breaks the circuit, stopping the current flow. The model shows a circuit with an ammeter indicating a gradual increase in current as the fan power increases. Eventually, the fusible element blows, breaking the circuit and stopping the flow of electricity
