sourcingmap 20 x 1/2W Watt 100K ohm 100KR Carbon Film Resistor 0.5W

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To calculate the resistance value, you need to group the values of the significant digits bands — i.e., the values of the first two or three bands from the left, depending on the total number of bands. Then you need to multiply that value by the multiplier to get the resistance value of the resistor. The same approach is used with capacitors: 2p2, 22p, 220p, 2n2, 22n, 220n, 2u2, 22u, 220u. In the old days larger values were still marked µF so the next decade was marked 2200u but with large capacitor values common now we're seeing 2m2, 22m, etc. I've never seen an equivalent of the 'R' as in 2C2 for a 2.2 F - yet! 2F2 may be more sensible. The current use of 'R' would then be excused (4R7 instead of 4Ω7) on the basis that Ω isn't readily available on most keyboards. It’s easiest to learn four band resistors first. Once you learn the four band system, it is very easy to understand five and six band resistor color codes. The Four Band 100k Ohm Resistor

To calculate a 100K resistor, you would need to use a value of 100,000 ohms for the resistor value in the formula. For example, if you want to calculate the value of a 100K resistor that will allow a current of 1 ampere to flow through it when a voltage of 100 volts is applied across it, you would use the following formula: As SI units go, larger or smaller values of ohms can be matched with a prefix like kilo-, mega-, or giga-, to make large values easier to read. It's very common to see resistors in the kilohm (kΩ) and megaohm (MΩ) range (much less common to see miliohm (mΩ) resistors). For example, a 4,700Ω resistor is equivalent to a 4.7kΩ resistor, and a 5,600,000Ω resistor can be written as 5,600kΩ or (more commonly as) 5.6MΩ. Schematic symbol Coded components have at least three bands: two significant figure bands and a multiplier, but there are other possible variations. For example, components that are made to military specifications are typically four-band resistors that may have a fifth band that indicates the reliability of the resistor in terms of failure rate percentage per 1000 hours of service. It is also possible to have a 5 th band that is the temperature coefficient, which indicates the change in resistance of the component as a function of ambient temperature in terms of ppm/K. In a three-band resistor, the first two bands represent the first two significant digits followed by one band for the multiplier. Since no tolerance band is available, the tolerance will always be ±20%. They are passive components, meaning they only consume power (and can't generate it). Resistors are usually added to circuits where they complement active components like op-amps, microcontrollers, and other integrated circuits. Commonly resistors are used to limit current, divide voltages, and pull-up I/O lines. Resistor unitsThe first three bands in a four band resistor tell us the resistor’s nominal value, and the 4th band gives us the tolerance of the resistor. Band Four – Tolerance: Gives the value of the tolerance for the resistor. The most common values are 5% (designated by a gold band), and 10% (designated by a silver band). This example uses a gold band, giving us a tolerance of 5%. More commonly, there are five-band resistors that are more precise due to a third significant figure band. This shifts the position of the multiplier and tolerance band into the 4 th and 5 th position as compared to a typical four-band resistor. Use the following to calculate the resistance of a conductor. This calculator assumes the conductor is round. Length:

To calculate the minimum and maximum resistance values, we multiply the resistance value by the tolerance percentage to come up with the following values: So it was decided that "R" would represent a "x1" multiplier. So now you can write "39R" instead of "39Ω". I wrote a little code in excel, to whatch the effect of changing the value(s) of the resistor(s), which of course had to be within the common E12 range.Four band resistors have two bands for the value, one for the multiplier, and one for the tolerance. Color-coding is a method used to indicate the resistive value, tolerance, and temperature coefficient of resistors with low wattage rating because of their small size. Color bands are used because they can be easily and cheaply printed on a small electronic component. Color-coding is also used for capacitors, inductors and diodes.

Resistors will come in one of two termination-types: through-hole or surface-mount. These types of resistors are usually abbreviated as either PTH (plated through-hole) or SMD/SMT (surface-mount technology or device). Six band resistors are exactly like five band resistors except they have an extra band to indicate the temperature coefficient, i.e. how much the resistance will change with temperature. But, dropping the "Ω" leaves the problem of how to represent a resistor value when the multiplier is 1. If the fourth band is silver, this means that the tolerance is 10% and the total resistance is 100kΩ ± 10% Ω. The actual resistance should be between 90,000 Ω and 110,000 Ω. In a five-band resistor, the first three bands represent the first three significant digits. The fourth band represents the multiplier. The fifth band represents the tolerance.The coding is defined in the international standard IEC 60062:2016. It describes the coding standard for both resistors and capacitors. Reading Color Codes The third band is the multiplier. Multiply the value designated by the first two bands with the multiplier to find the full value of the resistor.

Tolerance is the percentage of error between the actual measured resistive value and the stated value. This is due to the manufacturing process and it is expressed as a percentage of its preferred value Calculating

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Five band resistors have a third significant digit band between the first two bands and the multiplier band. Five band resistors also have a wider range of tolerances available. The third, blue band, is the multiplier. Using the table, the multiplier is thus 1,000,000. This multiplier is multiplied by the significant figures determined from the previous bands, in this case 52, resulting in a value of 52,000,000 Ω, or 52 MΩ.