define a unit charge
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SI Unit of Electric Charge
A coulomb is defined as the amount of charge that passes via electrical conductor carrying one ampere per second.
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The amount of charge in 1 electron (elementary charge) is defined as a fundamental constant in the SI system of units, (effective from 20 May 2019). The value for elementary charge, when expressed in the SI unit for electric charge (coulomb), is exactly 1.602 176 634 × 10 −19 C.
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