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n. A measure of the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance, and usually represented in complex notation as Z = R + iX, where R is the ohmic resistance and X is the reactance.

n. An analogous measure of resistance to an alternating effect, as the resistance to vibration of the medium in sound transmission.

n. A measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, inductive and capacitive reactance. Represented by the symbol Z.

n. a measure of opposition to motion of something subjected to a force.

n. the sound pressure divided by the particle velocity and the surface area through which an acoustic wave propagates.

n. a measure of the opposition caused by differences between two paradigms, especially between object-oriented development and relational databases

n. The apparent resistance in an electric circuit to the flow of an alternating current, analogous to the actual electrical resistance to a direct current, being the ratio of electromotive force to the current. It is equal to R2 + X2, where R = ohmic resistance, X = reactance. For an inductive circuit, X = 2πfL, where f = frequency and L = self-inductance; for a circuit with capacity X = 1 ÷ 2πfC, where C = capacity.

n. Hindrance; specifically, in electricity, an apparent increase of resistance due to induction in a circuit.

n. Impedance is the apparent resistance of an alternating-current circuit, or the ratio of the electromotive force consumed by an alternating current, divided by the current. On account of the electromotive force consumed by self-induction, the apparent resistance with alternating currents is greater than that with direct currents, though the power-consumption is the same. The impedance consists of two components—resistance, which consumes power, and reactance, which is the wattless resistance due to self-induction. See resistance, 3, and reactance.

n. a material's opposition to the flow of electric current; measured in ohms

"‡ The term impedance is most often encountered in dealing with antennas and speakers in television, stereo, and radio systems."

electrical phenomenon   

absolute impedance    internal impedance    impedance factor   

impediment   

ohmage   

credence   

capacitance    voltage    bandwidth    resistor    reactance    attenuation    conductivity    torque    admittance    waveform