Electronics69 by Liverpudlian: How To Read Resistor Colors ...
The first two bands represent the most significant digits of the resistance value. Colors are assigned to all the numbers between 0 and 9, and the color bands basically translate the numbers into a visible code. Black is 0, brown is 1, red is 2 and so on (see the color code table below). So, for example, if a resistor has brown and red as the first two bands, the most significant digits will be 1 and 2 (12). The third band indicates the multiplier telling you the power of ten to which the two significant digits must be multiplied (or how many zeros to add), using the same assigned value for each color as in the previous step. For example, if this band is red (2), you will multiply it by 10 Note : If the multiplier band is gold or silver, the decimal point is moved to the left by one or two places (divided by 10 or 100). The tolerance band (the deviation from the specified value) is next, usually spaced away from the others, or it's a little bit wider. A color is assigned to each tolerance: gold is 5%, silver is 10%. 20% resistors have only 3 color bands - the tolerance band is missing. The temperature coefficient is more commonly marked, especially on quality 5-band resistors, as it starts to become an important factor for precision components. For a resistor with temperature coefficient of 200 ppm, for example, a change in temperature of 50°C causes a value change of 1%. The most common values for this band are presented in the color chart above. Examples: Four band code: Green, blue, red, with silver tolerance band: 56 x 100 = 5.6 kohms, with a tolerance of 10% Standard EIA Decade Resistor Values Resistors are available in standard values such as 1K, 2.2K, 4.7K, and so on. The two most common standards are the E12 and E24 . You will notice that in the E12 series each succeeding value falls within +/- 10% of the previous value. The E24 range includes all of the E12 values, plus a further 12 to enable the selection of more precise resistances. The E6 (20%) range is a subset of the E12 (10%) range and the E12 range is a subset of the E24 (5%) range. Similarly, the E48 (2%) range is a subset of the E96 (1%) range and the E96 range is a subset of the E192 (0.5% or less) range.
How To Read A Resister - Bookshelf
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to heat.There are two types of resistors-fixed and variable. A fixed resistor has a fixed ... How to read the resister color code. Values = 1st Digit , 2st Digit , ...