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For brevity, the notation omits to always specify the unit (ohm or farad) explicitly and instead relies on implicit knowledge raised from the usage of specific letters either only for resistors or for capacitors, [nb 1] the case used (uppercase letters are typically used for resistors, lowercase letters for capacitors), [nb 2] a part's appearance, and the context.
The IEEE 315 standard contains a list of Class Designation Letters to use for electrical and electronic assemblies. For example, the letter R is a reference prefix for the resistors of an assembly, C for capacitors, K for relays. Industrial electrical installations often use reference designators according to IEC 81346.
Class 2 ceramic capacitors Code system regarding to EIA RS-198 for some temperature ranges and inherent change of capacitance Letter code low temperature Number code upper temperature Letter code change of capacitance over the temperature range X = −55 °C (−67 °F) 4 = +65 °C (+149 °F) P = ±10% Y = −30 °C (−22 °F)
IEC/EN 60062 specifies a letter code for each tolerance. Tolerances of capacitors and their letter codes E series Tolerance C R > 10 pF Letter code C R < 10 pF
Smaller capacitors, such as ceramic types, often use a shorthand-notation consisting of three digits and an optional letter, where the digits (XYZ) denote the capacitance in picofarad (pF), calculated as XY × 10 Z, and the letter indicating the tolerance. Common tolerances are ±5%, ±10%, and ±20%, denotes as J, K, and M, respectively.
An electrolytic capacitor is a polarized capacitor whose anode or positive plate is made of a metal ... series E6, tolerance ±20%, letter code "M" rated capacitance ...
The first letter of the color code is matched by order of increasing magnitude. The electronic color codes, in order, are: 0 = Black; 1 = Brown; 2 = Red; 3 = Orange;
A 2.26 kΩ, 1%-precision resistor with 5 color bands (), from top, 2-2-6-1-1; the last two brown bands indicate the multiplier (×10) and the tolerance (1%).. An electronic color code or electronic colour code (see spelling differences) is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others.
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