Electric current - Wikipedia
网页An electric current is a flow of charged particles, [1] [2] [3] such as electrons or ions, moving through an electrical conductor or space. It is defined as the net rate of flow of electric charge through a surface.
Electric current | Formula & Definition | Britannica
网页2024年9月20日 · Electric current, any movement of electric charge carriers such as electrons, protons, ions, or holes. Electric current in a wire, where the charge carriers are electrons, is a measure of the quantity of charge passing any point of the wire per unit of …
9.2: Electrical Current - Physics LibreTexts
网页The rate at which the charges flow past a location—that is, the amount of charge per unit time—is known as the electrical current. When charges flow through a medium, the current depends on the voltage applied, the material through which the charges flow, and the state of …
Physics Tutorial: Electric Current - The Physics Classroom
网页Electric current is the rate at which electric charge flows past a point on the electric circuit. Water current is the rate at which water flows past a point on the water circuit. As such, current is analogous to the number of gallons of water flowing into, along, and out of a slide per unit of time.
Electric Current: What is it? (Formula, Units, AC vs DC)
网页2021年5月9日 · Electric current is defined as a stream of charged particles—like electrons or ions—moving through a conductor or space. It measures how fast electric charge flows through a medium over time. The symbol for electric current in formulas is “I” or “i”. The unit for current is the ampere (A).
Electric Current - The Physics Hypertextbook
网页Electric current is defined as the rate at which charge flows through a surface (the cross section of a wire, for example). Despite referring to many different things, the word current is often used by itself instead of the longer, more formal "electric current".
20.1: Current - Physics LibreTexts
网页2022年2月20日 · Electric current \(I\) is the rate at which charge flows, given by \[I = \dfrac{\Delta Q}{\Delta t,}\] where \(\Delta Q\) is the amount of charge passing through an area in time \(\Delta t\). The direction of conventional current is taken as the direction in which positive charge moves.
Electric Current - HyperPhysics
网页Electric current is the rate of charge flow past a given point in an electric circuit, measured in Coulombs/second which is named Amperes. In most DC electric circuits, it can be assumed that the resistance to current flow is a constant so that the current in the circuit is related to voltage and resistance by Ohm's law.
What Is Electric Current? - Live Science
网页2016年3月1日 · Electric current is electric charge in motion. It can take the form of a sudden discharge of static electricity, such as a lightning bolt or a spark between your finger and a ground light...
Electric Current - Definition, Types, Properties, Effects, FAQs
网页Electric Current is the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere. Electrons are minute particles that exist within the molecular structure of a substance.
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