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1 ampere of current is equal to how many number of electrons?
One ampere of current is defined as the flow of one coulomb of charge per second. Since the elementary charge of a single electron is approximately 1.602×10−19 coulombs, the number of electrons required to constitute one coulomb of charge is calculated by the reciprocal of this elementary charge.
SI Brochure: The International System of Units (SI)
One ampere of current is defined as the flow of one coulomb of charge per second. Since the elementary charge of a single electron is approximately 1.602×10−19 coulombs, the number of electrons required to constitute one coulomb of charge is calculated by the reciprocal of this elementary charge.
I=tQ — Current as rate of charge flow
n=eQ — Relation between number of electrons and total charge
Current (I) is defined as the rate of flow of charge (Q) with respect to time (t), expressed as I=tQ. To find the number of electrons (n) corresponding to a charge of 1 coulomb, we use Q=n×e, where e is the elementary charge 1.602×10−19 C. Rearranging gives n=eQ=1.602×10−191≈6.242×1018 electrons.
The elementary charge e≈1.602176634×10−19 C
One ampere is equivalent to one coulomb per second
The value 6.25×1018 is the standard rounded approximation used in electrical engineering
Calculation of charge accumulation in capacitors
Understanding drift velocity and electron flow in conductors
The value 6.25×1018 is obtained by calculating 1/1.6×10−19.
Options involving 10−18 represent a fraction of a single electron's charge and are physically incorrect for a macroscopic current of 1 ampere.
D is correct — 1 ampere of current corresponds to approximately 6.25×1018 electrons flowing per second.
Always remember the electron charge value 1.6×10−19 C to quickly derive the number of electrons for any given charge quantity.
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