when a fuse is rated 8 A, it means
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It means that it will not work if current is less than 8A. It has a resistance of 8 ohm.
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Every fuse has been give particular thickness to with stand particular electrical current strength, the current value 8 A means that the fuse will melt or will burn out if the current passing through the fuse exceeds 8A, other than that the fuse will work fine even if the current supplied lower than that of 8A. In most cases the fuse strength is taken higher to avoid burning in case of high voltage input due to technical or mechanical or electrical fault in the distribution lines.
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