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The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Usually expressed in volts per metre, the vector direction of the field is the line of greatest slope of potential, and ...
electric current: ampere (A) moment of inertia: kilogram meter squared (kg⋅m 2) intensity: watt per square meter (W/m 2) imaginary unit: unitless electric current: ampere (A) ^ Cartesian x-axis basis unit vector unitless current density: ampere per square meter (A/m 2) impulse
tech: peak power output of a Nimitz-class aircraft carrier: 5 × 10 8 W tech: typical power output of a fossil fuel power station: 9 × 10 8 W tech: electric power output of a CANDU nuclear reactor 9.59 × 10 8 W geo: average electrical power consumption of Zimbabwe in 1998 9.86 × 10 8 W
Electric field from positive to negative charges. Gauss's law describes the relationship between an electric field and electric charges: an electric field points away from positive charges and towards negative charges, and the net outflow of the electric field through a closed surface is proportional to the enclosed charge, including bound charge due to polarization of material.
In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. . Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to t
The ampere is an SI base unit and electric current is a base quantity in the International System of Quantities (ISQ). [4]: 15 Electric current is also known as amperage and is measured using a device called an ammeter. [2]: 788 Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers.
The SI defines the coulomb as "the quantity of electricity carried in 1 second by a current of 1 ampere". Then the value of the elementary charge e is defined to be 1.602 176 634 × 10 −19 C. [3]
Green G, An Essay on the Application of Mathematical Analysis to the Theories of Electricity and Magnetism, T Wheelhouse, 1828. Heaviside O, Electromagnetic Theory, 3rd ed, 3 vols, The Electrician, 1893, 1899, 1912. Hertz H, Electric Waves: Being Researches on the Propagation of Electric Action with Finite Velocity through Space, Macmillan, 1893.