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Electrical impedance, or simply impedance, describes a measure of opposition to a sinusoidal alternating current (AC). Electrical impedance extends the concept of resistance to AC circuits, describing not only the relative amplitudes of the voltage and current, but also the relative phases. In general impedance is a complex quantity and the term complex impedance may be used interchangeably; the polar form conveniently captures both magnitude and phase characteristics, where the magnitude gives the change in voltage amplitude for a given current amplitude, while the argument gives the phase difference between voltage and current. In Cartesian form, where the real part of impedance is the resistance and the imaginary part is the reactance . Dimensionally, impedance is the same as resistance; the SI unit is the ohm. The term impedance was coined by Oliver Heaviside in July 1886. A graphical representation of the complex impedance plane. Note that while reactance can be either positive or negative, resistance is always positive.IRC Chat channels
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Last news  Engineers harness cell phone technology for use in medical imaging  New concept sends medical images via cellular phones  Indigenous population at risk from Taser rollout: academics  Analyzing circuit sensitivity for analog circuit design Top websites  Electrical impedance - Wikipedia, the free encyclopedia  electrical impedance -- Britannica Online Encyclopedia  Impedance - Wikipedia, the free encyclopedia  Imaginis - What is Electrical Impedance?  Electrical impedance: Definition and Much More from Answers.com  SKIN EFFECT AND BIO-ELECTRICAL IMPEDANCE ANALYSIS  Electrin Impedance Myography: Beth Israel Deaconess Medical Center - Boston, Hospital, electric, research,  Electrical Impedance Scanning of the Breast  Electrical Impedance Imaging Laboratory at Rensselaer  Electrical Impedance Mismatch Posts in groups Re: phonograph to usp adapter ...I don't think that cryogenics are required, just very low impedances. Or maybe both. Liquid Nitrogen cooled pre-amps are already made...most cases because there is not the option of very low impedance or there are other sources of noise that are not directly related to electrical impedance per se. For example, the Cosmic Background Explorer satellite took great pains to use liquid helium... Re: wattage distribution question ...>>> anything to do with the electrical impedance or power handling capabilities. ...research before you question others? The impedance of a cabinet varies tremendously with frequency. There are large impedance peaks to either side of the port's tuning frequency. The impedance rises steadily as frequency rises .... The third is the *acoustic* impedance of the cabinet. I don'... Re: wattage distribution question ...has anything to do with the electrical impedance or power handling capabilities. ... before you question others? The impedance of a cabinet varies tremendously with frequency. There are large impedance peaks to either side of ... port's tuning frequency. The impedance rises steadily as frequency rises .... Cabinet resonance and voice coil impedance are rather different things. Coil ... Re: wattage distribution question ... by the loudspeaker systems complex impedance at the particular frequency(s).... BY the loudspeaker systems complex impedance at the particular frequency(s).... Practically speaking, of course, when impedance rises with a relatively constant ... will have a relatively high impedance and draw little current from...anything to do with the electrical impedance or power handling capabilities... Re: wattage distribution question ...>>> anything to do with the electrical impedance or power handling capabilities. ...research before you question others? The impedance of a cabinet varies tremendously with frequency. There are large impedance peaks to either side of the port's tuning frequency. The impedance rises steadily as frequency rises ... response, the cab's acoustic impedance might be the largest component ... Re: wattage distribution question ... anything to do with the electrical impedance or power handling capabilities. I... research before you question others? The impedance of a cabinet varies tremendously with frequency. There are large impedance peaks to either side of the port's tuning frequency. The impedance rises steadily as frequency rises above.... The third is the *acoustic* impedance of the cabinet. I don't... Re: wattage distribution question ... that has anything to do with the electrical impedance or power handling capabilities. I believe you are confused on the rest...some research before you question others? The impedance of a cabinet varies tremendously with frequency. There are large impedance peaks to either side of the port's tuning frequency. The impedance rises steadily as frequency rises above that... Re: wattage distribution question ... by the loudspeaker systems complex impedance at the particular frequency(s).... BY the loudspeaker systems complex impedance at the particular frequency(s). ... will have a relatively high impedance and draw little current from ... anything to do with the electrical impedance or power handling capabilities.... an effect on overall loudspeaker impedance as the raw drivers Le ... Re: wattage distribution question ... for any reason, where the impedance (AC) varies with frequency. Virtually all...> by the loudspeaker systems complex impedance at the particular frequency(s).... BY the loudspeaker systems complex impedance at the particular frequency(s).... will have a relatively high impedance and draw little current from ... anything to do with the electrical impedance or power handling capabilities.... Re: triple algorithms ... a mathematical construct, hence mathematical property. A sheet of carbon fibre has many physical attributes which all can be described mathematically, electrical impedence, tensile strength, rigidity etc, right down to the molecular structure. Mathematical descriptions of physical objects and how they behave and why.... |
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