Electrical Engineering ⇒ Topic : Definitions of electric and magnetic S.I Units
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Gaurav
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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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