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Answered

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Why do resistors have tolerance?

Sagot :

AL2006
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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