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  1. Common symbolsI
    SI unitampere

    Electric current - Wikipedia

    • An electric current is a flow of charged particles, 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. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers … See more

    Symbol

    The conventional symbol for current is I, which originates from the French phrase intensité du courant, (current intensity). Current intensity is often referred to simply as current. The I symbol was used by André-Mari… See more

    Conventions

    The conventional direction of current, also known as conventional current, is arbitrarily defined as the direction in which positive charges flow. In a conductive material, the moving charged particles that constitute the electric curr… See more

    Ohm's law

    Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usua… See more

    Alternating and direct current

    In alternating current (AC) systems, the movement of electric charge periodically reverses direction. AC is the form of electric power most commonly delivered to businesses and residences. The usual waveform of … See more

    Occurrences

    Natural observable examples of electric current include lightning, static electric discharge, and the solar wind, the source of the polar auroras.
    Man-made occurrences of electric current include the … See more

    Measurement

    Current can be measured using an ammeter.
    Electric current can be directly measured with a galvanometer, but this method involves breaking the electrical circuit, which is sometim… See more

    Resistive heating

    Joule heating, also known as ohmic heating and resistive heating, is the process of power dissipation by which the passage of an electric current through a conductor increases the internal energy of the conductor, … See more

     
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