Electrical Engineering ⇒ Topic : Definitions of electric and magnetic S.I Units
DEFINITIONS OF ELECTRIC AND MAGNETIC S.I. UNITS
One ampere (A) is that constant current which if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section and placed 1 m apart in vacuum, would produce between these conductors a force equal to 2 x 10-7 N per metre of length.
One coulomb (C) is the quantity of electricity transported in 1 s by 1 A.
A volt (V) is defined as the difference of electrical potential between two points of a conductor carrying a constant current of 1 A, when the power dissipated between these points is equal to 1 W.
One ohm (Ω) is the resistance between two points of a conductor when a constant difference of potential of 1 V, applied between these points, produces in this conductor a current of 1 A, the conductor not being a source of any electromotive force.
One henry (H) is the inductance of a closed circuit in which of an emf of 1 V is produced when the electric current in the circuit varies uniformly at the rate of 1 A/s.
(Note: This also applies to the emf in one circuit produced by a varying current in a second circuit, i.e., mutual inductance.)
One farad (F) is the capacitance of a capacitor between the plates of which there appears a difference of potential of 1 V when it is charged by 1 C of electricity.
One weber (Wb) is the magnetic flux which, linking a circuit of one turn,produces in it an emf of 1 V when it is reduced to zero at uniform rate is 1 s.One tesla (T) is the magnetic flux density equal to 1 Wb/m2.
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