Resistors are rated in ohms and have a color code on them to indicate their value, tolerance, and sometimes quality.

Resistors are rated in ohms and have a color code on them to indicate their value, tolerance, and sometimes quality.

• A. False
• B. True
• C. Not sure
• D. Cannot determine

Answer: (B)

Resistors use color bands to convey their resistance value in ohms, how accurate that value is (tolerance), and sometimes additional specifications like temperature coefficient. In the common four-band code, the first two colors are the significant digits, the third is the multiplier (power of ten), and the fourth is the tolerance. For example, red, violet, yellow, gold represents 27 × 10^4 ohms with a ±5% tolerance (270 kΩ ±5%). Some resistors use a five-band scheme with three digits, then a multiplier and a tolerance, and may include a fifth band for temperature coefficient. Because those bands encode both the value and how precise it is (and sometimes other specs), the statement is true.

Resistors use color bands to convey their resistance value in ohms, how accurate that value is (tolerance), and sometimes additional specifications like temperature coefficient. In the common four-band code, the first two colors are the significant digits, the third is the multiplier (power of ten), and the fourth is the tolerance. For example, red, violet, yellow, gold represents 27 × 10^4 ohms with a ±5% tolerance (270 kΩ ±5%). Some resistors use a five-band scheme with three digits, then a multiplier and a tolerance, and may include a fifth band for temperature coefficient. Because those bands encode both the value and how precise it is (and sometimes other specs), the statement is true.