Resistor color bands encode value and tolerance using a fixed two-digit-plus-multiplier scheme

Standard through-hole resistors carry 4 colour bands: the first two represent decimal digits (0 to 9 per the colour table: black=0, brown=1, red=2, orange=3, yellow=4, green=5, blue=6, violet=7, grey=8, white=9), the third band is a multiplier (power of 10), and the fourth (gold or silver) indicates tolerance (5 percent or 10 percent). Example: brown-black-yellow-silver = 10 times 10,000 = 100k ohm plus or minus 10 percent. This knowledge is essential for clock-hacking: you need to read the value of the timing resistor before removing it and find a correct replacement. Surface-mount devices use a different numerical code.

Examples

orange-orange-red-gold = 3300 ohm plus or minus 5 percent. brown-black-yellow-silver = 100k ohm plus or minus 10 percent.

Assessment

Decode the resistor stripe sequence: red-violet-orange-gold. Then describe what resistor you would look for to cut the frequency of a clock that uses this resistor by roughly half.