Impedance

In electrical engineering, Impedance is a measure of opposition to a sinusoidal electric current. The concept of impedance generalizes Ohm's law in AC circuit analysis. Unlike electrical resistance, the impedance of an electric circuit is a complex number. Oliver Heaviside coined the term impedance in July of 1886.

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In general, the solutions for the voltages and currents in a circuit containing resistors, capacitors and inductors (in short, all linear behaving components) are solutions to a linear ordinary differential equation. It can be shown that if the voltage and/or current sources in the circuit are sinusoidal and of constant frequency, the solutions tend to a form referred to as AC steady state. In this case, all of the voltages and currents in the circuit are sinusoidal and constant in peak amplitude, frequency and phase.

Electrical engineering: Electrical engineering is an engineering discipline that deals with the study and application of electricity and electromagnetism. Its practitioners are called electrical engineers. Electrical engineering is a broad field that encompasses many subfields including those that deal with power, contro...

Electric current: Electric current means, depending on the context, a flow of electric charge (a phenomenon) or the rate of flow of electric charge (a quantity)....

Electrical resistance: Electrical resistance is a measure of the degree to which an object opposes the passage of an electric current. The SI unit of electrical resistance is the ohm. Its reciprocal quantity is electrical conductance measured in siemens....