Editing Resistor (section)

==Electronic symbols and notation==
{{Main article|Electronic symbol|RKM code}}

Two typical [[schematic diagram]] symbols are as follows:
<gallery>
File:Resistor, Rheostat (variable resistor), and Potentiometer symbols.svg| [[ANSI]]-style: (a)&nbsp;resistor, (b)&nbsp;rheostat (variable resistor), and (c)&nbsp;potentiometer
File:Resistor_symbol_IEC.svg|[[International Electrotechnical Commission|IEC]] resistor symbol
</gallery>

The notation to state a resistor's value in a circuit diagram varies.

One common scheme is the [[RKM code]] following [[IEC 60062]]. Rather than using a [[decimal separator]], this notation uses a letter loosely associated with SI prefixes corresponding with the part's resistance. For example, ''8K2''<!-- with uppercase K! --> as part [[marking code]], in a [[circuit diagram]] or in a [[bill of materials]] (BOM) indicates a resistor value of 8.2&nbsp;kΩ. Additional zeros imply a tighter tolerance, for example ''15M0'' for three significant digits. When the value can be expressed without the need for a prefix (that is, multiplicator 1), an "R" is used instead of the decimal separator. For example, ''1R2'' indicates 1.2&nbsp;Ω, and ''18R'' indicates 18&nbsp;Ω.