How do i apply the tolerance of the resistor in its values? pls?

Question

Using the tolerance as for minimum or maximum resistance values of the resistor? could you give me some example please? tanku.

Answer 1

Multiple the tolerance by the value of the resistor to get the 1/2 the range of resistance. For example, a 10kohm, 5% resistor gives

10kohm * .05 = 0.5kohm = 500 ohms. So the resistor value will be somewhere between 10kohm +/- 500 ohms, or 9.5 to 10.5kohm.

Don't be surprised if nearly every 5% resistor you ever measure is within 1 or 2% near room temperature. The tolerance value applys across the temperature range of the resistor, so the actual value at room temp is usually pretty close to the nominal value.

Answer 2

I agree witht he previous folks. One additional comment. Sometimes you may notice that the resistor values very near the specified value are not present in a set of loose tolerance resistors. This is because the resistors that are close to the specified value have been selected out for sale as tighter tolerance units.

Answer 3

You use the min. and max. resistance values in your stress analysis (parts application analysis) and worst-case analysis.

When you analyze your circuit to find out if it will function at the highest and lowest temperatures expected, that's when you use the min. and max. resistance values. Every formula for voltage dividers, bias circuits, current limiters, etc. that use resistors, should be re-calculated for the highest and lowest possible resistance values based on tolerance, and for change in resistance due to temperature coefficient, all to find out if your circuit will function as expected.

Note: other components should also be examined as well, such as transistors' gain, voltage drops, etc.

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