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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 equation of current is: [1] where. is the current flowing. is the change in electric charge. is the change in time. The SI unit of electric current is the ampere (A). This is equal to one coulomb of charge in one second. Electric current can be found in wires, batteries, and lightning .
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When 1 coulomb of electricity moves past somewhere in 1 second, the current is 1 ampere. To measure current at one point, we use an ammeter. Voltage, also called "potential difference", is the "push" behind the current. It is the amount of work per electric charge that an electric source can do.
