ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Electrical fuses. Collection of electrical fuses and fuse wires. Fuses are designed to protect an electrical circuit from overload. When excessive electrical current passes through a fuse it melts the wire. This breaks the circuit and prevents the current from damaging other devices. Some of the fuses are labelled with the amount of current they will melt at. This current is measured in amps (A) or milliamps (mA). Fuse wire is used to repair a fuse that has blown, though the circuit should be checked first for potentially fatal faults. The resistance of a wire decreases with its thickness, hence the thicker wire for higher-rated fuses.
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