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Four resistors, each 100 ohm with a tolerance of 5%, are connected in series to make a 400 ohm resistance. What is the tolerance of the combined resistance?

1. 5%
2. 20%
3. 10%
4. 15%

Correct answer: 5%

Solution

Each resistor contributes ±5 ohm, so the series total is 400 ± 20 ohm. The percentage tolerance is 20/400 = 5%.

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