Resistance of a Carbon Resistor

Resistance of a Carbon Resistor - • Black =0 • Brown =1...

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How to Determine the Resistance of a Carbon Resistor The carbon resistor, an essential component of most electric circuits, opposes current flow, thereby providing a usable load into which a circuit may operate. For this load to be effective, the value of the carbon must have the correct resistance. Sizes of Carbon Resistor A carbon resistor looks like a firecracker with a fuse on both ends. Resistors normally come in sizes of 1/8 watt, 1/4 watt, 1/2 watt, 1 watt, and 2 watts. The 1/8 watt resistor is about 1/4 inch long and 1/16 inch wide, and the 2 watt resistor is about 1 inch long and 5/16 wide. Color codes of the Resistor To facilitate reading the value of a resistor, you will need to know the color code:
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Unformatted text preview: • Black =0 • Brown =1 • Red =2 • Orange =3 • Yellow =4 • Green =5 • Blue =6 • Violet =7 • Gray =8 and white=9 For tolerances Silver = +10% and gold = +5%. To measure the resistance of resistor The Greek letter omega is the universal symbol for ohms, the unit in which resistance is measured. Each resistor has four colored bands; the first three indicate the amount of resistance and the fourth indicates the amount of tolerance. The first step in determining the resistance relates to Band 1. Determine its color, note the digit value (0 to 9) of the color from the color code, and record the digit....
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This note was uploaded on 04/06/2010 for the course ENG 202 taught by Professor Pam during the Spring '10 term at University of Massachusetts Boston.

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