If a resistor has color bands red, red, black, what is its value in ohms?

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Multiple Choice

If a resistor has color bands red, red, black, what is its value in ohms?

Colors on a resistor encode its resistance using digits and a multiplier. For a three-band code, the first two bands are the significant digits and the third is the multiplier. Here, red represents 2 for both of the first two bands, giving 22. The multiplier band is black, which stands for 10^0, or 1. So 22 × 1 = 22 ohms. If there were a fourth band, it would indicate tolerance, but with three bands the tolerance isn’t shown.

Colors on a resistor encode its resistance using digits and a multiplier. For a three-band code, the first two bands are the significant digits and the third is the multiplier. Here, red represents 2 for both of the first two bands, giving 22. The multiplier band is black, which stands for 10^0, or 1. So 22 × 1 = 22 ohms. If there were a fourth band, it would indicate tolerance, but with three bands the tolerance isn’t shown.

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