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impedance
impedance in electricity, measure in ohms of the degree to which an electric circuit resists the flow of electric current when a voltage is impressed across its terminals. Impedance is expressed as the ratio of the voltage impressed across a pair of terminals to the current flow between those... Read more |
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transformer
transformer electrical device used to transfer an alternating current or voltage from one electric circuit to another by means of electromagnetic induction . The simplest type of transformer consists of two coils of wire, electrically insulated from one another and arranged so that a change in the... Read more |
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Ohms law
Ohm's law [for G. S. Ohm ], law stating that the electric current i flowing through a given resistance r is equal to the applied voltage v divided by the resistance, or i = v / r. For general application to alternating-current circuits where inductances and capacitances as well as... Read more |
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switch
switch electrical device having two states: on, or closed; and off, or open. Ideally a switch offers a zero impedance to a current when it is closed, and it offers infinite impedance when open. Mechanical switches, which operate by moving contacts together and apart, are often classified by the... Read more |
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capacitance
capacitance in electricity, capability of a body, system, circuit, or device for storing electric charge. Capacitance is expressed as the ratio of stored charge in coulombs to the impressed potential difference in volts. The resulting unit of capacitance is the farad [for Michael Faraday ]. In... Read more |
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resistance
resistance property of an electric conductor by which it opposes a flow of electricity and dissipates electrical energy away from the circuit, usually as heat. Optimum resistance is provided by a conductor that is long, small in cross section, and of a material that conducts poorly. Resistance is... Read more |
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inductance
inductance quantity that measures the electromagnetic induction of an electric circuit component; it is a property of the component itself rather than of the circuit as a whole. The self-inductance, L, of a circuit component determines the magnitude of the electromagnetic force (emf) induced in... Read more |
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electricity
electricity class of phenomena arising from the existence of charge . The basic unit of charge is that on the proton or electron —the proton's charge is designated as positive while the electron's is negative. There are three basic systems of units used to measure electrical quantities,... Read more |
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conduction
conduction transfer of heat or electricity through a substance, resulting from a difference in temperature between different parts of the substance, in the case of heat, or from a difference in electric potential , in the case of electricity. Since heat is energy associated with the... Read more |
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roaring forties
roaring forties name applied, especially by sailors, to the latitudes between 40°S and 50°S, where the prevailing westerly winds are strong and steady. Unlike the winds in the Northern Hemisphere, those in the roaring forties are not impeded by large land areas.... Read more |
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atmospheric electricity
...consequently has a slight electrical conductivity, although for...charge, or an ultra-high-impedance electrometer voltmeter.The electrical conductivity of air depends...raindrop will split apart if the electrical forces exceed the surface... |
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conductance
...a direct current (DC) circuit, it is the reciprocal of electrical resistance that opposes the flow. This means it is multiplied...circuit, it is the resistance divided by the square of impedance (the opposition of a circuit to the passage of a current... |
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bio-electrical impedance
bio‐electrical impedance (BIE) A method of measuring the proportion of fat in the body by the difference in the resistance to passage of an electric current between fat and lean tissue. |
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match
...reaching or equaling (a standard or quality): he tried to match her nonchalance. ∎ equalize (two coupled electrical impedances) so as to bring about the maximum transfer of power from one to the other. 3. place (a person or group) in... |
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bactometer
bactometer A device for the estimation of bacterial contamination within a few hours, based on measuring the early stages of breakdown of nutrients by the bacteria through changes in the electrical impedance of the medium. |
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BIE
BIE See bio‐electrical impedance. |
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admittance
ad·mit·tance / ədˈmitns/ • n. 1. the process or fact of entering or being allowed to enter a place or institution: people were unable to gain admittance to the hall. 2. Physics a measure of electrical conduction, numerically equal to the reciprocal of the impedance. |
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reflection
...reflected from a reflector according to Snell's law. A seismic reflection occurs as a result of a contrast in acoustic impedances; an electromagnetic reflection occurs because of a contrast in electrical and dielectrical properties. |
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Electrical impedance of the cochlear implant lubricants hyaluronic acid,...
...scala tympani. The electrical impedances of these...stem response. The impedances of hyaluronic acid...excessively high impedance at low frequencies...available on the electrical properties of these...the intracochlear ... |
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Electrical impedance measurement as an endpoint detection method for routine...
...adapted to measure electrical impedance changes in plasma...A) and electrical impedance simultaneously. The...To prevent spurious electrical interference, both...connected to the mains electrical supply via an ONEAC... |
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Electrical Impedance as a Novel Biomarker of Myotube Atrophy and Hypertrophy.
...thickness via measuring cellular electrical impedance. They showed that both qualitative and quantitative changes in electrical impedance as a function of cellular...hypertrophy prevents changes in electrical impedance. ... |
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Electrical impedance--what lies beneath: understanding impedance unlocks a...
...law and the definition of electrical resistance as the ability...circuit to resist the flow of electrical current. Although useful...values. Inductors have an impedance of j[omega]L, and capacitors...frequency of the signal. The impedances of these ... |
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Frequency-division multiplexing for electrical impedance tomography in...
Electrical impedance tomography (EIT) produces an image of the electrical impedance distribution of tissues in the body...implications due to dispersions as the tissue's electrical properties change with frequency. Another significant... |
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Electrical impedance measurements: an objective measure of prelabor cervical...
...Objective: To investigate the use of electrical impedance measurements of the pregnant...study of 86 women, investigating electrical impedance measurements of the...induction of labor. Transfer electrical impedance ... |
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WIPO ASSIGNS PATENT TO SCIBASE FOR "METHOD AND DEVICE FOR QUALITY ASSESSMENT...
...FOR QUALITY ASSESSMENT OF AN ELECTRICAL IMPEDANCE MEASUREMENT ON TISSUE." Applicants...of assessing the quality of an electrical impedance measurement on tissue...also relates to a device for electrical impedance measurement ... |
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US Patent Issued to Avago Technologies Wireless IP (Singapore) Pte. on Dec....
...Bulk Acoustic Resonator Electrical Impedance Transformers" was invented by...Patent & Trademark Office: "An electrical impedance transformer comprises...resonator (FBAR), having a first electrical impedance and a first ... |
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Simulation of a inverse problem in electrical impedance tomography using...
...the most challenging tasks in electrical impedance tomography because of the mathematical...resistance network analogues for electrical imaging. The algorithm is based...Newton Raphson method. KEYWORDS electrical impedance tomography; ... |
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Electrical impedance spectroscopy may measure radiation injury noninvasively.
...tissue injury using noninvasive electrical impedance spectroscopy (EIS). "A detailed...we evaluate the ability of electrical impedance spectroscopy (EIS...time-points, is encouraging. Electrical impedance spectroscopy may ... |
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