LEARN A LITTLE. TRY A LITTLE.

Resistor Color Code Practice

Read the stripes. Build the answer. Ten questions at your own pace, with a little help whenever you need it.

YOUR PRACTICE SESSION

Pick your challenge.

Question typeResistor type

Changing either setting starts a new ten-question session.

0 / 10Completed

0Solved

0First try, no hints

“Solved” includes successful retries. Revealed answers count as completed, but not solved. There is no timer and nothing is saved after you leave.

Need the color reference?

Digits and multipliers
Color	Digit	Multiply by
Black	0	×1
Brown	1	×10
Red	2	×100
Orange	3	×1000
Yellow	4	×10000
Green	5	×100000
Blue	6	×1000000
Violet	7	×10000000
Gray	8	×100000000
White	9	×1000000000
Gold	—	×0.1
Silver	—	×0.01

First band cannot be black. The last band is tolerance: Brown ±1%; Red ±2%; Green ±0.5%; Blue ±0.25%; Violet ±0.1%; Gray ±0.05%; Gold ±5%; Silver ±10%.

Using the reference counts as help for the current question.

QUESTION 1 OF 10

NO RUSH. JUST PRACTICE.

What do these bands tell you?

LOOK FOR THE PATTERN

Digits first. Multiplier next. Tolerance last.

A four-band resistor has two significant digits. A five-band resistor has three. Join those digits, multiply by the multiplier band, then read the tolerance. Gold and silver multipliers make smaller values: ×0.1 and ×0.01.

Orange · orange · brown · gold
33 × 10 = 330 Ω ±5%

You can answer using Ω, kΩ, or MΩ: 1 kΩ = 1,000 Ω and 1 MΩ = 1,000,000 Ω. Color names appear below each drawing so the quiz does not depend on distinguishing shades.

Questions use valid four- and five-band codes, including a range of tolerance bands. They are practice examples rather than a catalog of stocked components.

Resistor Color Code Practice

What do these bands tell you?

Ten questions. More understanding.

Digits first. Multiplier next. Tolerance last.