1) Electric resistance 2) Electrical phenomenon 3) Electrical resistance 4) Measured in ohms 5) Obstacle 6) Ohmic resistance 7) Resistance 8) Resistivity
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1) Ohmage 2) Resistivity
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• (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 = 2/fL, where f = frequency and L =...
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http://thinkexist.com/dictionary/meaning/impedance/
(Z) The quantity that measures the opposition of a circuit to the passage of a current and therefore determines the amplitude of the current. In a DC (direct current) circuit this is the resistance (R) alone. In an AC (alternating current) circuit, however, the reactance (X) als...
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Apparent resistance to flow of electrical current; sometimes used to detect bacterial growth in liquid culture because impedance decreases.
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for a linear two-terminal element or two-terminal circuit with terminals A and B under sinusoidal conditions, quotient of the phasor U
AB representing the voltage between the terminals by the phasor I representing the electric current in the element or circuit: where the voltage is the line integral of the electric field stren...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-12-43
at a given frequency, quotient of a dynamic field quantity (such as force, sound pressure) by a kinematic field quantity (such as vibration velocity, particle velocity), or quotient of a voltage by a current NOTE 1 - The term impedance is generally applied to a linear system and to steady sinusoidal signals. NOTE 2 - In the case of a transient, imp...
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1) A term for the electrical resistance found in a/c circuits. Affects the ability of a cable to transmit low level (e.g. sound) signals over a long distance. Measured in Ohms. Speakers are rated according to power handling capabilities (Watts, W) and impedance (Ohms).
2) The total opposition offered by an electric circuit to the flow of an alte...
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http://www.encyclo.co.uk/local/20447
Is the opposition to flow of electrical current made up of resistance (a property of the material at specified temperature), capacitance and inductance.
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http://www.encyclo.co.uk/local/20474
A measure of the AC (alternating current) resistance to the flow of electrical or acoustic energy. In electronics it is measured in Ohms
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http://www.encyclo.co.uk/local/20532
1. Total opposition to flow. When flow is steady, impedance is simply the resistance, e.g., the driving pressure per unit flow; when flow is changing, impedance also includes the factors that oppose changes in flow. Thus, deviations of impedance, from simple ohmic resistance because of the effects of capacitance and inductance, become more importan...
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http://www.encyclo.co.uk/local/20973
(im-pēd´әns) obstruction or opposition to passage or flow, as of an electric current or other form of energy. the resistance in alternating current circuits, represented by the letter Z in mathematical formulas. Medical equipment is often rated according to impedance to allow for optimum perform...
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http://www.encyclo.co.uk/local/21001
A measure of the impediment to the flow of alternating current, measured in ohms at a given frequency. Larger numbers mean higher resistance to current flow.
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http://www.encyclo.co.uk/local/21058
Im·ped'ance noun [ Impede + -ance .] (Electricity) 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 R
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http://www.encyclo.co.uk/webster/I/17
A measure of the response of an electric circuit to an electric current. The actual value is frequency dependent. The current is opposed by the capacitance, inductance and resistance of the circuit.
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http://www.mpoweruk.com/glossary.htm
Impedance is the total opposition offered by a circuit to the flow of alternating current.
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http://www.probertencyclopaedia.com/browse/GI.HTM
At it most general electronic level, impedance is the amount of resistance and / or reactance offered by an electronic circuit or device to the (AC) current which flows through it. It is commonly represented by the mathematical symbol 'Z', and is measured in Ohms. Some people may have had an unwelcome brush with the laws of impedance when (usually ...
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(Z) Impedance is the measure of resistance specifically related to an alternating current. Resistance is only the measure of voltage for direct current. Impedance, however, takes into account the variation in current and establishing a range of resistance. It is measured in ohms. The variable for impedance is Z
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impedance 1. Something that delays or prevents progress, or the preventing of progress. 2. Electricity opposition to flow of alternating current; the opposition in an electrical circuit to the flow of alternating current, consisting of resistance and reactance. 3. The ratio of the pressure to the volume displacement at a given surface in a sound-t...
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1) The total opposing force to the flow of current in an ac circuit. 2) The total resistance to flow of an alternating current generally expressed in ohms. It is a combination of resistance and reactance.
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http://www.youngco.com/young2.asp?ID=4&Type=3
A property of all metallic and electrical conductors that describes the total opposition to current flow in an electrical circuit. Resistance, inductance, capacitance and conductance have various influences on the impedance, depending on frequency, dielectric material around conductors, physical relationship between conductors and external factors....
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http://www.zoo.co.uk/~z0001325/Glossary.html
Acoustic ImpedanceThe total reaction of a medium to the transmission of sound through it, expressed as the ratio of sound pressure to particle velocity at a given point in the medium. The acoustic impedance Z is useful in describing the acoustic radiation from sources such as surfaces and ducts.Mechanical ImpedanceMechanical impedance is the ratio ...
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https://www.encyclo.co.uk/local/20687
A measure of the total opposition to the flow of alternating current (A.C.) round a circuit; a complex combination of ohmic resistance and reactance.
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https://www.encyclo.co.uk/local/20820
See Resistance.
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https://www.encyclo.co.uk/local/21463
A measure of the opposition to the flow of an alternating signal by its media.
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https://www.encyclo.co.uk/local/22803
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