Carbon resistors often come as a brown cylinder with colored bands. These colored bands can be read to determine the manufacturer's target resistance value. The first two bands (L and M) represent the number. The third band (N) represents the order of magnitude - basically how many zeros to add. The fourth band (S) represents a tolerance. A tolerance of 5% (gold band) means that most resistors will fall within 5% of the labeled value. A silver band represents 10% and no color represents 20%. Black 0brown 1red 2orange 3yellow 4green 5blue 6violet 7gray 8white 9Green (5), Red (2), Red (2) with a silver band would represent a resistor with a resistance of 52e2 ohms, which is 5200 ohms or 5.2 kohms. The tolerance would be 10%. What would be the resistance and tolerance for the following two cases? a) Yellow, Violet, Red, Gold:b) Red, Black, Green, nothing:

Question

Engineering

Marlee Haley

5 August, 09:00

Carbon resistors often come as a brown cylinder with colored bands. These colored bands can be read to determine the manufacturer's target resistance value. The first two bands (L and M) represent the number. The third band (N) represents the order of magnitude - basically how many zeros to add. The fourth band (S) represents a tolerance. A tolerance of 5% (gold band) means that most resistors will fall within 5% of the labeled value. A silver band represents 10% and no color represents 20%. Black 0brown 1red 2orange 3yellow 4green 5blue 6violet 7gray 8white 9Green (5), Red (2), Red (2) with a silver band would represent a resistor with a resistance of 52e2 ohms, which is 5200 ohms or 5.2 kohms. The tolerance would be 10%. What would be the resistance and tolerance for the following two cases? a) Yellow, Violet, Red, Gold:b) Red, Black, Green, nothing:

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Answers (1)

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Gage Brennan · Answer 1

a) 4.7 kΩ, + / - 5%

b) 2.0 MΩ, + / - 20%

Explanation:

a) If the resistor has the following combination of color bands:

1) Yellow = 1st digit = 4

2) Violet = 2nd digit = 7

3) Red = multiplier = 10e2

4) Gold = tolerance = + / - 5%

this means that the resistor has 4700 Ω (or 4.7 kΩ), with 5% tolerance.

b) Repeating the process for the following combination of color bands:

1) Red = 1st digit = 2

2) Black = 2nd digit = 0

3) Green = multiplier = 10e5

4) Nothing = tolerance = + / - 20%

This combination represents to a resistor of 2*10⁶ Ω (or 2.0 MΩ), with + / - 20% tolerance.