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Temperature Compensation All resistors change value when the temperature changes dramatically. And because resistors dissipate power, they can get hot just because of the current they carry. Often, this current is so tiny that it doesn t appreciably heat the resistor. But in some cases it does, and the resistance will change. Then a circuit might behave differently than it did when the resistor was still cool. There are various ways to approach problems of resistors changing value when they get hot. One method is to use specially manufactured resistors that do not appreciably change value when they get hot. Such units are called temperature-compensated. But one of these can cost several times as much as an ordinary resistor. Another approach is to use a power rating that is much higher than the actual dissipated power in the resistor. This will keep the resistor from getting very hot. Still another scheme is to use a series-parallel network of identical resistors to increase the power dissipation rating. Alternatively, you can take several resistors, say three of them, each with about three times the intended resistance, and connect them all in parallel. Or you can take several resistors, say four of them, each with about one-fourth the intended resistance, and connect them in series. It is unwise to combine resistors with different values. This can result in one of them taking most of the load while the others loaf, and the combination will be no better than the single hot resistor you started with. How about using two resistors with half (or twice) the value you need, but with opposite resistance-versus-temperature characteristics, and connecting them in series or parallel It is tempting to suppose that if you do this, the component whose resistance decreases with heat (negative temperature coefficient) will have a canceling-out effect on the component whose resistance goes up ( positive temperature coefficient). This can sometimes work, but in practice it s difficult to find a pair of resistances that will do this job just right. The Color Code for Resistors Some resistors have color bands that indicate their values and tolerances. You ll see three, four, or five bands around carbon-composition resistors and film resistors. Other units are large enough so that the values can be printed on them in ordinary numerals. On resistors with axial leads (wires that come straight out of both ends), the first, second, third, fourth, and fifth bands are arranged as shown in Fig. 6-12A. On resistors with radial leads (wires that come off the ends at right angles to the axis of the component body), the colored regions are arranged as shown in Fig. 6-12B. The first two regions represent numbers 0 through 9, and the third region represents a multiplier of 10 to some power. (For the moment, don t worry about the fourth and fifth regions.) Refer to Table 6-1. Suppose you find a resistor whose first three bands are yellow, violet, and red, in that order. Then the resistance is 4700 . Read yellow = 4, violet = 7, red = 100. As another example, suppose you find a resistor with bands of blue, gray, orange. Refer to Table 6-1 and determine blue = 6, gray = 8, orange = 1000. Therefore, the value is 68,000 = 68 k . The fourth band, if there is one, indicates tolerance. If it s silver, it means the resistor is rated at 10%. If it s gold, the resistor is rated at 5%. If there is no fourth band, the resistor is rated at 20%. The fifth band, if there is one, indicates the maximum percentage that the resistance can be expected to change after 1000 hours of use. A brown band indicates a maximum change of 1% of the rated value. A red band indicates 0.1%. An orange band indicates 0.01%. A yellow band indicates 0.001%. If there is no fifth band, it means that the resistor might deviate by more than 1% of the rated value after 1000 hours of use.
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