In resistor color code, what digit does the black color band represent?

• A. 0
• B. 1
• C. 1000
• D. 100

Answer: (A)

In the resistor color code, each color stands for a digit from 0 to 9, and black is the one that represents zero. The color-to-digit map goes black = 0, brown = 1, red = 2, orange = 3, yellow = 4, green = 5, blue = 6, violet = 7, gray = 8, white = 9. Since this item asks for the digit the black band represents, the correct value is zero. The other options aren’t digits for the black band: one corresponds to a different color, and 100 or 1000 are multipliers (they describe powers of ten for the multiplier band), not the digit shown by the band.