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Fischer
Physics
11 January, 15:12
Why do resistors have tolerance?
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Devin Lamb
11 January, 15:34
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Machines capable of manufacturing exactly the same component time after time,
with exactly the resistance you want, would be very expensive, and so would the
products they turn out. A resistor would cost a dollar instead of a few pennies.
The machine itself, and its output, work within tolerances.
The cheapest mass-produced resistors are guaranteed to be within 20% above
or below the resistance marked on them. And you know what? For most bench-
work and prototyping, that's usually close enough.
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