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‘Electrical circuit’ means anything that uses electricity, for instance an iron, a kettle or a TV.
The electrical current needed to blow a fuse is the ‘fuse rating’, for instance 3 amps, 10 amps or 13 amps.
When a fuse removes the electrical current the fuse has ‘blown’ – a blown fuse.
A fuse is a current sensitive piece of wire – when the fuse is working the wire is not broken, when the fuse has ‘blown’ the wire breaks. |
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This web page explains what a fuse is and why a fuse blows.
What Is A Fuse?
A fuse is an electrical safety item that removes electrical current from an electrical circuit when the current in the electrical circuit is too high.
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About Fuses |
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Home > Advice – Domestic Electrical & Central Heating > About Fuses |
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Why Does A Fuse Blow?
A fuse blows because the electrical current through the fuse is too high.
The high electrical current through the fuse melts the wire inside the fuse.
High electrical current is unsafe – the fuse blows and removes all electrical current.
The usual cause of high current is a faulty electrical appliance, for instance a kettle or toaster.
A fuse has a rating, say 5 amps or 13 amps; if the electrical current goes above the fuse rating, the fuse blows.
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