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A resistor doesn't deteriorate with age, and has no particular 'life-span',

as long as it's used properly.

-- A resistor in a box on the shelf, or in a circuit where it stays cool, will last

indefinitely.

-- A resistor in a circuit where it's forced to dissipate enough power to make it

hot may change its resistance value permanently, but will continue to operate.

-- A resistor in a circuit where it's forced to dissipate even more than that,

to a ridiculous extreme, may melt or explode. When that happens, it's the

end of the resistor's life-span. But it wasn't the resistor's fault.

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