**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. The standard abbreviations for the units are

1 A = 1C/s

Thus, current as a rate quantity would be expressed mathematically as

Note that the equation above uses the symbol

**I**to represent the quantity current
As is the usual case, when a quantity is introduced in The Physics Classroom, the standard metric unit used to express that quantity is introduced as well. The standard metric unit for current is the

**ampere**. Ampere is often shortened to*Amp*and is abbreviated by the unit symbol**A**. A current of 1 ampere means that there is 1 coulomb of charge passing through a cross section of a wire every 1 second**1 ampere = 1 coulomb / 1 second**

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