Electric current

A simple electric circuit, where current is represented by the letter i. The relationship between the voltage (V), resistance (R), and current (I) is V=IR; this is known as Ohm's law.

An electric current is a flow of electric charge. [1]:2 In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionised gas ( plasma). [2]

The SI unit for measuring an electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulomb per second. Electric current is measured using a device called an ammeter. [3]

Electric currents cause Joule heating, which creates light in incandescent light bulbs. They also create magnetic fields, which are used in motors, inductors and generators.

The moving charged particles in an electric current are called charge carriers. In metals, one or more electrons from each atom are loosely bound to the atom, and can move freely about within the metal. These conduction electrons are the charge carriers in metal conductors.


The conventional symbol for current is I, which originates from the French phrase intensité de courant, (current intensity). [4] [5] Current intensity is often referred to simply as current. [6] The I symbol was used by André-Marie Ampère, after whom the unit of electric current is named, in formulating Ampère's force law (1820). [7] The notation travelled from France to Great Britain, where it became standard, although at least one journal did not change from using C to I until 1896. [8]

Other Languages
Alemannisch: Elektrischer Strom
العربية: تيار كهربائي
azərbaycanca: Elektrik cərəyanı
Bân-lâm-gú: Tiān-liû
беларуская: Электрычны ток
беларуская (тарашкевіца)‎: Электрычны ток
Esperanto: Elektra kurento
한국어: 전류
Ido: Korento
Bahasa Indonesia: Arus listrik
interlingua: Currente electric
íslenska: Rafstraumur
עברית: זרם חשמלי
қазақша: Электр тогы
Kiswahili: Mkondo wa umeme
Kreyòl ayisyen: Kouran elektrik
lietuvių: Elektros srovė
македонски: Електрична струја
Malagasy: Rianaratra
മലയാളം: വൈദ്യുതധാര
მარგალური: ელექტრული დენი
Bahasa Melayu: Arus elektrik
မြန်မာဘာသာ: လျှပ်စီး
Nederlands: Elektrische stroom
日本語: 電流
нохчийн: Ток
norsk nynorsk: Elektrisk straum
oʻzbekcha/ўзбекча: Elektr toki
ਪੰਜਾਬੀ: ਚਲੰਤ ਬਿਜਲੀ
پنجابی: کرنٹ
Piemontèis: Corent elétrica
português: Corrente elétrica
Qaraqalpaqsha: Elektr togı
română: Curent electric
Simple English: Electric current
slovenščina: Električni tok
ślůnski: Sztrům
српски / srpski: Електрична струја
srpskohrvatski / српскохрватски: Električna struja
Basa Sunda: Arus listrik
татарча/tatarça: Электр агымы
українська: Електричний струм
اردو: برقی رو
ئۇيغۇرچە / Uyghurche: توك ئېقىمى
Tiếng Việt: Dòng điện
粵語: 電流
中文: 电流