state the formula of electric current and define its unit
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The relationship between current and resistance in an electric circuit. Current is usually denoted by the symbol I. Ohm's law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm's law is I = V/R.
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A magnetic field produced by a small section of wire with electric current i. A common unit of electric current is the ampere, which is defined as a flow of one coulomb of charge per second, or 6.2 × 1018 electrons per second. ... One ampere equals 3 × 109 esu per second.
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