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11 January, 15:12

Why do resistors have tolerance?

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  1. 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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