Abstract
The derived SI electrical units are defined as follows: the volt (V)—the unit of potential difference and electromotive force, is the potential difference between two points of a conducting wire carrying a constant current of 1 ampere (1 A), when the power dissipated between these points is equal to 1 W. The ohm (Ω)—the unit of electrical resistance, is the electric resistance between two points of a conductor when a constant potential difference of 1 V, applied to these points, produces in the conductor a current of 1 A, the conductor not being the seat of any electromotive force. The coulomb (C)—the unit of quantity of electricity, is the quantity of electricity carried in 1 s by a current of 1 A. The farad (F)—the unit of capacitance, is the capacitance of a capacitor between the plates of which there appears a potential difference of 1 V when it is charged by a quantity of electricity of 1 C.
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