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

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Resistors are electronic components which have a specific, never-changing electrical resistance. The resistor's resistance limits the flow of electrons through a circuit. When the resistor body surface is large enough, as in large wattage resistors, the resistance value, tolerance, and wattage are usually printed on the body of the resistor. Surface mounted resistors (SMD) use another coding system that uses alphanumeric codes printed on its surface instead of color codes. The final band indicates the tolerance of the resistor. The tolerance explains how much more or less the actual resistance of the resistor can be compared to what its nominal value is. No resistor is made to perfection, and different manufacturing processes will result in better or worse tolerances. For example, a 1kΩ resistor with 5% tolerance could actually be anywhere between 0.95kΩ and 1.05kΩ. Band One – 1 st Digit: This is the first digit of the resistance value. The first band is brown, which corresponds to a value of 1. In a typical four-band resistor, the first and second bands represent significant figures. For this example, refer to the figure above with a green, red, blue, and gold band. Using the table provided below, the green band represents the number 5, and the red band is 2.

In this case, the last two bands (i.e. the fifth and sixth bands) should be closely spaced, with a gap between the fourth and fifth bands. Power is the rate at which energy is transformed into something else. It's calculated by multiplying the voltage difference across two points by the current running between them, and is measured in units of a watt (W). Light bulbs, for example, power electricity into light. But a resistor can only turn electrical energy running through it into heat. Heat isn't usually a nice playmate with electronics; too much heat leads to smoke, sparks, and fire! 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 unitsSince it is a four-band resistor, the first two bands (violet and green) will indicate the significant digits which are, according to the table above; 75. This calculator will help you identify the value, tolerance and temperature coefficient of a color coded resistor by simply selecting the bands colors. It will also calculate the minimum and maximum values based on the tolerance ratio. This calculator supports resistors with 3, 4, 5, and 6 bands. How to use? 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.

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. 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. We then multiply that number by the multiplier indicated with the 3 rd band (yellow) which has the value of; x10 4 = 10000.Four band resistors have two bands for the value, one for the multiplier, and one for the tolerance. I was just wondering if a 100K resistor as a pulldown resistor might conflict with internal eletronics, resulting in not pulling the port low all the way. 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: 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. How do you tell which band is first and last? The last, tolerance band is often clearly separated from the value bands, and usually it'll either be silver or gold. Five and Six Band Resistors

The coding is defined in the international standard IEC 60062:2016. It describes the coding standard for both resistors and capacitors. Reading Color Codes On the most precise of resistors, a 6 th band may be present. The first three bands would be the significant figure bands, the 4 th the multiplier, the 5 th the tolerance, and the 6 th could be either reliability or temperature coefficient. There are also other possible variations, but these are some of the more common configurations. Six band resistors are basically five band resistors with an additional band at the end that indicates the temperature coefficient. This indicates the expected change in resistor value as the temperature changes in degrees Celsius. Generally these temperature coefficient values are extremely small, in the ppm range. Decoding Resistor Color BandsResistors manufactured for military use, may include an additional band indicating the failure rate. Other Resources Let's take for example a four-band resistor with the following band colors: Violet Green Yellow Gold