Resistors and Color Code Rings

Resistors are used to control the flow of current in a circuit, by "resisting" the flow of electrons. The value of a resistor is measured in ohms (R).

Resistance is defined as the ratio of the potential difference (voltage) across a conductor, to the current flowing through it according to Ohm's law.
The resistance and tolerance of a resistor are usually indicated by a series of four or five colored rings or dots. To determine the Resistance of a Resistor by its Color Coded Rings, use Table below.

1. Turn the resistor so the gold or silver stripe is at the right end of the resistor.
2. The first two stripes on the left correspond to the first two digits of the resistance value.
3. The third stripe from the left corresponds to a multiplication value.
4. Multiply the two-digit number from step 2 by the multiplier of step 3. This number is the value of the resistance in W. The fourth ring indicates the accuracy of the resistor (e.g., A gold stripe means that the value of the resistance may vary by 5% from the value given by the first three stripes.) .

 

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Resistors and Color Code Rings
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