A resistor has no fourth band; tolerance is 20%.

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Prepare for the NCCER Introduction to Electrical Circuits exam. Utilize flashcards and multiple choice questions with hints and explanations to excel on your test.

Multiple Choice

A resistor has no fourth band; tolerance is 20%.

Explanation:
In resistor color coding, the last band represents tolerance. If a resistor uses the four-band code and there is no fourth band, the tolerance is assumed to be ±20%. That’s why the correct answer is 20%. The other tolerances correspond to specific colors (brown = ±1%, gold = ±5%, silver = ±10%). But with no fourth band present, the default tolerance is the 20% option.

In resistor color coding, the last band represents tolerance. If a resistor uses the four-band code and there is no fourth band, the tolerance is assumed to be ±20%. That’s why the correct answer is 20%. The other tolerances correspond to specific colors (brown = ±1%, gold = ±5%, silver = ±10%). But with no fourth band present, the default tolerance is the 20% option.

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