The conventional symbol for electric current is I. The SI unit of electric current is the ampere or amp (symbol A), which is the flow of charged particles at a rate of one coulomb per second.
More specifically, it is a rate of flow of electrons in a circuit like shown in the picture above. Electric CurrentĪn electric current is a rate of flow of charged particles or charge carriers (electrons, ions, or electron holes) through a region of a conductor, which can be metal (for example, a wire), electrolyte (for example, a neuron) or semiconductor (for example, a transistor). More information about electric charge, linear charge density, surface charge density and volume charge density and their units of measurement. By moving a charge from one place to another, we can transfer electrical energy. Electric charge in motion represents a current, which is discussed below.
Although we can observe the transferring of charges in any electrical circuit, the amount of charge is not changed because electrons are neither created nor destroyed. In the SI system, the unit for measuring an electric charge is a coulomb, which is equal to the electric charge passing through the cross-section of a conductor carrying a current of one ampere for one second. Opposite charges attract each other and charges of the same sign repel each other. An electric charge causes a body to experience a force when placed in an electromagnetic field. A power-transmission line is an example of a device for transferring energy from the place where it is generated to places where it is consumedĪn electric charge or the amount of charge is a physical scalar quantity that determines the ability of bodies to create electromagnetic fields and take part in electromagnetic interaction.
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