Color codes for resistors indicate resistance and tolerance.

• A. A sequence of bands that indicate voltage and tolerance
• B. Sequence of colors that indicate resistance and tolerance
• C. Alphabetic order of color names
• D. Color pattern for wire gauge

Answer: (B)

Color codes on resistors are a numeric coding system that translates color bands into the resistance value and its tolerance. In the common four-band scheme, the first two bands are the significant digits, the third band is the multiplier (how many zeros to add), and the fourth band is the tolerance, which shows how precise the value is. For example, brown, black, red, gold means 10 × 100 = 1000 ohms with a ±5% tolerance. The color-to-digit mapping is fixed (black 0, brown 1, red 2, and so on), and tolerance bands like gold or silver indicate the allowed deviation. This coloring does not convey voltage or wire gauge; those are determined separately.