Editing Resistor (section)

===SMT resistors===
[[File:Zero ohm resistors cropped.jpg|thumb|This image shows four surface-mount resistors (the component at the upper left is a [[capacitor]]) including two [[zero-ohm resistor]]s. Zero-ohm links are often used instead of wire links, so that they can be inserted by a resistor-inserting machine. Their resistance is negligible. ]]

[[Surface-mount technology|Surface mounted]] resistors of larger sizes (metric [[Surface-mount technology#Packages|1608]] and above) are printed with numerical values in a code related to that used on axial resistors. Standard-tolerance [[surface-mount technology|surface-mount technology (SMT)]] resistors are marked with a three-digit code, in which the first two digits are the first two [[significant digit]]s of the value and the third digit is the power of ten (the number of zeroes). For example:

* 334 = 33 × 10<sup>4</sup> Ω = 330 kΩ
* 222 = 22 × 10<sup>2</sup> Ω = 2.2 kΩ
* 473 = 47 × 10<sup>3</sup> Ω = 47 kΩ
* 105 = 10 × 10<sup>5</sup> Ω = 1 MΩ

Resistances less than 100 Ω are written: 100, 220, 470. The final zero represents ten to the power zero, which is&nbsp;1. For example:

* 100 = 10 × 10<sup>0</sup> Ω = 10 Ω
* 220 = 22 × 10<sup>0</sup> Ω = 22 Ω

Sometimes these values are marked as 10 or 22 to prevent a mistake.

Resistances less than 10 Ω have 'R' to indicate the position of the decimal point ([[radix point]]). For example:

* 4R7 = 4.7 Ω
* R300 = 0.30 Ω
* 0R22 = 0.22 Ω
* 0R01 = 0.01 Ω

000 and 0000 sometimes appear as values on surface-mount [[zero-ohm link]]s, since these have (approximately) zero resistance.

More recent surface-mount resistors are too small, physically, to permit practical markings to be applied.