15 relations: Electrical engineering, Electrical impedance, Electrical reactance, Electrical resistance and conductance, Imaginary number, Immittance, International System of Units, Multiplicative inverse, Nodal admittance matrix, Ohm, Oliver Heaviside, Real number, SI electromagnetism units, Siemens (unit), Susceptance.

## Electrical engineering

Electrical engineering is a professional engineering discipline that generally deals with the study and application of electricity, electronics, and electromagnetism.

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## Electrical impedance

Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied.

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## Electrical reactance

In electrical and electronic systems, reactance is the opposition of a circuit element to a change in current or voltage, due to that element's inductance or capacitance.

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## Electrical resistance and conductance

The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor.

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## Imaginary number

An imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit,j is usually used in Engineering contexts where i has other meanings (such as electrical current) which is defined by its property.

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## Immittance

In electrical engineering and acoustics, immittance is a concept combining the '''im'''pedance and ad'''mittance''' of a system or circuit.

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## International System of Units

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.

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## Multiplicative inverse

In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/x or x−1, is a number which when multiplied by x yields the multiplicative identity, 1.

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## Nodal admittance matrix

In power engineering, nodal admittance matrix (or just admittance matrix) or Y Matrix or Ybus is an N x N matrix describing a power system with N buses.

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## Ohm

The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.

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## Oliver Heaviside

Oliver Heaviside FRS (18 May 1850 – 3 February 1925) was an English self-taught electrical engineer, mathematician, and physicist who adapted complex numbers to the study of electrical circuits, invented mathematical techniques for the solution of differential equations (equivalent to Laplace transforms), reformulated Maxwell's field equations in terms of electric and magnetic forces and energy flux, and independently co-formulated vector analysis.

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## Real number

In mathematics, a real number is a value of a continuous quantity that can represent a distance along a line.

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## SI electromagnetism units

No description.

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## Siemens (unit)

The siemens (symbol: S) is the derived unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).

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## Susceptance

In electrical engineering, susceptance (B) is the imaginary part of admittance, where the real part is conductance.

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