What is the total opposition in an AC circuit called?

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What is the total opposition in an AC circuit called?

In AC circuits, the total opposition to current is called impedance. It combines resistance, which dissipates power as heat, and reactance, which stores and releases energy in magnetic and electric fields. Impedance is represented as Z = R + jX, where R is resistance and X is reactance. The overall effect to current is quantified by the magnitude |Z| = sqrt(R^2 + X^2), and the phase between voltage and current is given by phi = arctan(X/R). If there’s only resistance, impedance equals R; if there’s only reactance, impedance is purely reactive (jX). Admittance is the reciprocal of impedance, describing how easily current flows.

In AC circuits, the total opposition to current is called impedance. It combines resistance, which dissipates power as heat, and reactance, which stores and releases energy in magnetic and electric fields. Impedance is represented as Z = R + jX, where R is resistance and X is reactance. The overall effect to current is quantified by the magnitude |Z| = sqrt(R^2 + X^2), and the phase between voltage and current is given by phi = arctan(X/R). If there’s only resistance, impedance equals R; if there’s only reactance, impedance is purely reactive (jX). Admittance is the reciprocal of impedance, describing how easily current flows.

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