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A resistor is one of the most common components used in electronics: it restricts the flow of electric current and produces a voltage drop Its value is color-coded by four bands, based on the standard of the Electronics Industries Alliance (EIA) As Table 101 shows, the meaning of each band depends on its position and color The band closest to the end of the resistor represents the first position number, depending on its color The second band represents the second position number The third band represents the multiplier The fourth band is used to show the tolerance of the resistor For example, say you have a band that s marked from the position closest to the end: red, violet, orange, and silver Using Table 101, you can see the first number is 2 and the second number is 7, which are the first and second position numbers, respectively That means the number is 27 The third position number, orange, means the multiplier is 1000 When you multiply 27 by 1000, you get the nominal resistor value of 27,000 ohms The resistor manufacturing process isn t perfect, and there s always some tolerance The last color band tells how much above or below the nominal resistor value the actual value may be The silver band in the last position means the actual resistor value is in the range of 10 percent of the nominal value That doesn t exactly mean the resistor is more or less than its nominal value it could be exactly the same value There are several types of resistors Fixed resistors have a fixed value in ohms Variable resistors (also called rheostats or potentiometers) can be adjusted from zero to their full value to alter the amount of resistance in a circuit Tapped resistors are a cross between a fixed and a variable resistor Like a variable resistor, tapped resistors can be adjusted Once adjusted, however, tapped resistors become like a fixed resistor and cannot be adjusted anymore Resistance is also shown by the letter R, and sequential numbers if there are multiple resistors For example, Rl, R2, and R3 might appear at various points along a circuit diagram near schematic drawings of resistors, indicating they re the first, second, and third resistors listed on the schematic diagram Sometimes, a resistance value is also shown on a diagram, using the Greek letter omega ( ) For instance, you might see 30 kW near a schematic symbol for a resistor
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Table 101 Color-Coded Bands Based on the Standard of the Electronics Industries Alliance (EIA) Color Black Brown Red Orange Yellow Green Blue Violet Gray White Gold Silver No color Band 1 0 1 2 3 4 5 6 7 8 9 Band 2 0 1 2 3 4 5 6 7 8 9 1 10 100 1000 10,000 100,000 1,000,000 10,000,000 100,000,000 01 001 Band 3 Band 4 1% 2% 3% 4% 5% 10% 20%
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Like resistors, capacitors are among the most common components used in electronics The capacitor stores electricity and acts as a filter It allows alternating current to flow, while blocking direct current A capacitor consists of two metal plates or electrodes separated by some kind of insulation, called dielectric, such as air, glass, mica, polypropylene film, or titanium acid barium The type of dielectric used affects how much capacitance can be obtained relative to the size of the capacitor, and in which applications it can best be used There are two types of capacitors: fixed and variable The tuning dial of a radio is generally attached to a fixed capacitor When you turn the dial, you re changing its frequency Many schematic symbols exist for identifying different types of capacitors The letter C is used to refer to all types of capacitors, however A whole number next to the letter C shows multiple capacitors exist and which one is within the circuit The value, or capacitance, of the capacitor, shown in microfarads, may also be near the schematic symbol
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