## Electrical resistance and conductance |

The **electrical resistance** of an
**electrical conductance**, and is the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with the notion of mechanical

An object of uniform cross section has a resistance proportional to its

The resistance (R) of an object is defined as the ratio of
*V*) to
*I*), while the conductance (G) is the inverse:

For a wide variety of materials and conditions, *V* and *I* are directly proportional to each other, and therefore *R* and *G* are
*ohmic* materials.

In other cases, such as a
*V* and *I* are *not* directly proportional. The ratio V/I is sometimes still useful, and is referred to as a "chordal resistance" or "static resistance",^{
[1]}^{
[2]} since it corresponds to the inverse slope of a chord between the origin and an
*I–V* curve

- introduction
- conductors and resistors
- ohm's law
- relation to resistivity and conductivity
- measuring resistance
- typical resistances
- static and differential resistance
- ac circuits
- energy dissipation and joule heating
- dependence of resistance on other conditions
- superconductivity
- see also
- references
- external links

In the

The
*drop**difference* between two sides of a pipe, not the pressure itself, determines the flow through it. For example, there may be a large water pressure above the pipe, which tries to push water down through the pipe. But there may be an equally large water pressure below the pipe, which tries to push water back up through the pipe. If these pressures are equal, no water flows. (In the image at right, the water pressure below the pipe is zero.)

The resistance and conductance of a wire, resistor, or other element is mostly determined by two properties:

- geometry (shape), and
- material

Geometry is important because it is more difficult to push water through a long, narrow pipe than a wide, short pipe. In the same way, a long, thin copper wire has higher resistance (lower conductance) than a short, thick copper wire.

Materials are important as well. A pipe filled with hair restricts the flow of water more than a clean pipe of the same shape and size. Similarly,

In addition to geometry and material, there are various other factors that influence resistance and conductance, such as temperature; see below.

Other Languages

Afrikaans: Elektriese weerstand en konduktansie

አማርኛ: መጠነ እንቅፋት

العربية: مقاومة وموصلية كهربائية

azərbaycanca: Elektrik müqaviməti

বাংলা: রোধ

Bân-lâm-gú: Tiān-chó͘

беларуская: Электрычнае супраціўленне

беларуская (тарашкевіца): Супор

български: Електрическо съпротивление

Boarisch: Elektrischa Widastaund

bosanski: Električni otpor

čeština: Elektrický odpor

chiShona: Mukweso

Cymraeg: Gwrthiant trydanol

dansk: Resistans

Deutsch: Elektrischer Widerstand

eesti: Takistus

Ελληνικά: Ηλεκτρική αντίσταση

español: Resistencia eléctrica

Esperanto: Elektra rezistanco

euskara: Erresistentzia elektriko

فارسی: مقاومت و رسانایی الکتریکی

français: Résistance (électricité)

Gaeilge: Friotaíocht agus seoltas leictreach

galego: Resistencia eléctrica

한국어: 전기저항

Հայերեն: Դիմադրություն (էլեկտրական)

हिन्दी: विद्युत प्रतिरोध

hrvatski: Električni otpor

Bahasa Indonesia: Hambatan listrik

íslenska: Rafmótstaða

italiano: Resistenza elettrica

עברית: מוליכות חשמלית

қазақша: Электрлік кедергі

Kreyòl ayisyen: Rezistans (kouran)

Latina: Resistentia electrica

latviešu: Elektriskā pretestība

lietuvių: Elektrinė varža

magyar: Elektromos ellenállás

македонски: Електричен отпор

മലയാളം: വൈദ്യുതപ്രതിരോധം

Bahasa Melayu: Rintangan elektrik

монгол: Цахилгаан эсэргүүцэл

Nederlands: Elektrische weerstand (eigenschap)

日本語: 電気抵抗

Nordfriisk: Elektrisk wederstant

norsk: Motstand (resistans)

norsk nynorsk: Elektrisk motstand

oʻzbekcha/ўзбекча: Elektr qarshilik

ਪੰਜਾਬੀ: ਬਿਜਲਈ ਅਵਰੋਧ

Plattdüütsch: Elektrisch Wedderstand

polski: Rezystancja

português: Resistência elétrica

română: Rezistență electrică

Runa Simi: Pinchikilla hark'ay

русский: Электрическое сопротивление

Seeltersk: Wierstand

shqip: Rezistenca elektrike

Simple English: Electrical resistance

slovenčina: Elektrický odpor

slovenščina: Električni upor

српски / srpski: Електрични отпор

srpskohrvatski / српскохрватски: Električni otpor

suomi: Resistanssi

svenska: Resistans

Tagalog: Resistensiya

தமிழ்: மின்தடை

татарча/tatarça: Электр каршылыгы

తెలుగు: విద్యున్నిరోధం మరియు వాహకత్వం

Türkmençe: Garşylyk (elektrik)

українська: Електричний опір

اردو: برقی مزاحمت

ئۇيغۇرچە / Uyghurche: قارشىلىق

Tiếng Việt: Điện trở

文言: 電阻

Wolof: Ndëgërlu gu mbëj

吴语: 电阻

粵語: 電阻

中文: 电阻