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1. (n.) impedance
the total opposition to alternating current by an electric circuit, equal to the square root of the sum of the squares of the resistance and reactance of the circuit and usu. expressed in ohms.
2. impedance
the ratio of the force on a system undergoing harmonic motion to the velocity of the particles in the system.
Etymology: (1886)
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| Definition of 'Impedance' |
Princeton's WordNet |
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1. (noun) electric resistance, electrical resistance, impedance, resistance, resistivity, ohmic resistance
a material's opposition to the flow of electric current; measured in ohms
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| Definition of 'Impedance' |
The Standard Electrical Dictionary |
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1. Impedance
The ratio of any impressed electro-motive force to the current which it produces in a conductor. For steady currents it is only the resistance. For variable currents it may include besides resistance inductance and permittance. It is the sum of all factors opposing a current, both ohmic and spurious resistances. It is often determined and expressed as ohms.
Synonym--Apparent Resistance--Virtual Resistance.
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Definitions of Impedance 
