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A resistor with a 100 ohms of resistance has 10% tolerance. What does this mean?

A The resistance may vary from 90 ohms to 110 ohms.

Tolerance of a resistor indicates how much the measured value of a resistance is different from its theoretical value, and is calculated using percentages. 10% tolerance means that the resistance can be more or less 10 ohms to compare with 100. A 100 ohms resistor with 10% tolerance may have values ranging from 90 ohms to 110 ohms.