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5 answers

1. Resisters with gold, silver, or no quality band have tolerances of plus or minus 5%, 10%, or 20%.

2. Multimeters are not perfect.

2007-11-28 15:41:35 · answer #1 · answered by Tim C 7 · 0 0

Agree with Tim C. Resistors and all other components have variations. Most electronic circuit designs can accept a 10 - 20% variation in component specs. If you need very precise value resistors, they are available in 2% and 1% tolerance ratings, and will cost more
Same with multimeters. More accurate models tend to cost more. If you use an analog multimeter instead of digital, accuracy is even trickier -- they tend to be more accurate at full-scale deflection i.e. when the needle is deflected almost all the way. At low deflections they can be 20% or more off, plus analog scales are harder to read accurately.

2007-11-29 00:08:48 · answer #2 · answered by dontpanic66 3 · 0 0

brown=0
black=1
red=2
orange =3
yellow 4
green 5
blue 6
violet 7
gray 8
white 9
1st band 2nd band resistance 3rd multiplier 4th band tolerence 1% 2% ...5% 10%

depending on the quality of the reisistor as denoted by the 4th band this will give the percent of it being off example 2200 can be +-10% so it will read + or - 10% of the stated value

2007-11-28 23:47:10 · answer #3 · answered by youstop2003 3 · 0 0

Because there is some minor variance, plus the meter will be less accurate as battery life goes on.

2007-11-28 23:37:39 · answer #4 · answered by Anonymous · 0 0

I believe that there is a + or - on resistors. The last color tells you the + or -

2007-11-28 23:39:08 · answer #5 · answered by paul p 1 · 0 0

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