Resistor

Resistor
Resistor.jpg
A typical axial-lead resistor
Type Passive
Working principle Electric resistance
Electronic symbol
Resistors.svg
Two common schematic symbols
Axial-lead resistors on tape. The component is cut from the tape during assembly and the part is inserted into the board.

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses. High-power resistors that can dissipate many watts of electrical power as heat may be used as part of motor controls, in power distribution systems, or as test loads for generators. Fixed resistors have resistances that only change slightly with temperature, time or operating voltage. Variable resistors can be used to adjust circuit elements (such as a volume control or a lamp dimmer), or as sensing devices for heat, light, humidity, force, or chemical activity.

Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in electronic equipment. Practical resistors as discrete components can be composed of various compounds and forms. Resistors are also implemented within integrated circuits.

The electrical function of a resistor is specified by its resistance: common commercial resistors are manufactured over a range of more than nine orders of magnitude. The nominal value of the resistance falls within the manufacturing tolerance, indicated on the component.

Electronic symbols and notation

Two typical schematic diagram symbols are as follows:

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

One common scheme is the letter and digit code for resistance values following IEC 60062. It avoids using a decimal separator and replaces the decimal separator with a letter loosely associated with SI prefixes corresponding with the part's resistance. For example, 8K2 as part marking code, in a circuit diagram or in a bill of materials (BOM) indicates a resistor value of 8.2 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 Ω, and 18R indicates 18 Ω.

Other Languages
Afrikaans: Resistor
العربية: مقاوم كهربي
aragonés: Resistor
azərbaycanca: Rezistor
تۆرکجه: دیرنچ
বাংলা: রোধক
Bân-lâm-gú: Tiān-chó͘-khì
башҡортса: Резистор
беларуская: Рэзістар
беларуская (тарашкевіца)‎: Рэзыстар
български: Резистор
bosanski: Otpornik
čeština: Rezistor
Cymraeg: Gwrthydd
eesti: Takisti
Ελληνικά: Αντιστάτης
español: Resistor
Esperanto: Rezistilo
Frysk: Wjerstân
Gaeilge: Friotóir
galego: Resistencia
한국어: 저항기
Հայերեն: Ռեզիստոր
हिन्दी: प्रतिरोधक
hrvatski: Otpornik
Bahasa Indonesia: Resistor
interlingua: Resistor
íslenska: Viðnámstæki
italiano: Resistore
עברית: נגד
Basa Jawa: Résistor
ಕನ್ನಡ: ರೋಧಕ
ქართული: რეზისტორი
қазақша: Резистор
Kreyòl ayisyen: Rezistò
Kurdî: Tirûş
Latina: Restitorium
latviešu: Rezistors
lietuvių: Rezistorius
македонски: Отпорник
മലയാളം: പ്രതിരോധകം
मराठी: रोधक
Bahasa Melayu: Perintang
монгол: Резистор
မြန်မာဘာသာ: လျှပ်ခံ
नेपाल भाषा: रेजिस्तर
日本語: 抵抗器
нохчийн: Резистор
Nordfriisk: Mötjstande
norsk bokmål: Motstand (resistor)
norsk nynorsk: Komponenten motstand
Oromoo: Rezisterii
oʻzbekcha/ўзбекча: Rezistor
پنجابی: روک
ភាសាខ្មែរ: រេស៊ីស្ទ័រ
polski: Opornik
português: Resistor
română: Rezistor
русиньскый: Резістор
русский: Резистор
Seeltersk: Wierstande
Simple English: Resistor
slovenčina: Rezistor
slovenščina: Upor (elektrotehnika)
српски / srpski: Отпорник
srpskohrvatski / српскохрватски: Otpornik
Basa Sunda: Résistor
suomi: Vastus
svenska: Resistor
Tagalog: Resistor
татарча/tatarça: Резистор
తెలుగు: నిరోధకం
українська: Резистор
اردو: مزاحم
Winaray: Resistor
ייִדיש: רעזיסטאר
粵語: 電阻器
中文: 電阻器