impedance definition
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impedance The definition of an impedance is any obstruction, or the measure of the opposition of an electric current to the energy flow when voltage is applied. 1  An example of impedance is when a school marching band cannot participate in a parade because they can't affort the cost of gas for the bus. An example of impedance is a line of resistance within an electrical current. the total opposition offered by an electric circuit to the flow of an alternating current of a single frequency: it is a combination of resistance and reactance and is measured in ohms: the reciprocal of admittance: symbol, Z.
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- A high-Z mic’s high. source impedance (approximately 10,000 ohms) combines with the capactive shunt reactance of the mic cable. to form a low-pass filter which progressively cuts high frequencies. The severity of the loss is determined primarily. by the length and construction of the cable.
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Loudspeaker Sensitivity & Impedance Explained The lowest impedance is measured at DC, which is also known as the DC resistance. The IEC method of specifying nominal loudspeaker impedance is set such that minimum impedance must not fall below 80% of nominal, so for an 8 ohm speaker this would be 6.4 ohms minimum, and for 4 ohms would be 3.2 ohms.
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Difference Between Resistance and Impedance The various Difference Between Resistance and Impedance are described below in detail. The opposition offered to the flow of current in an electric circuit whether AC or DC is known as the Resistance. The opposition offered to the flow of current in an AC circuit because of resistance, capacitance and inductance is known as Impedance.
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bioelectrical impedance bioelectrical impedance. Resistance to electrical current as it travels through body fluids and tissues. Its measurement is used in body composition analysis to determine total water, lean mass, and other body components.ioelectrical impedance (bīōe-lek´trikəl impē´dəns) , n a method of measuring total body fat that uses electrical current and is based on the premise that lean body mass is a better conductor of electricity than fat.
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- Complex impedance of an antenna is related to the electrical length of the antenna at the wavelength in use. The impedance of an antenna can be matched to the feed line and radio by adjusting the impedance of the feed line, using the feed line as an impedance transformer.
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Impedance Impedance is the complex-valued generalization of resistance. It may refer to: Acoustic impedance, a constant related to the propagation of sound waves in an acoustic medium.
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What's the difference between resistance and impedance? 1 Resistance is the opposition of electrical current flow. 2  Resistance occurs in AC & DC circuits. 3  In addition to Resistance, AC circuits also exhibit Reactance.  Reactance is also the opposition to electrical current flow.
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- Define imp. imp synonyms, imp pronunciation, imp translation, English dictionary definition of imp. n. 1. A mischievous child. 2. A small demon. 3. Obsolete A graft. tr.v. imped , imp·ing , imps 1. To graft onto the wing of a trained falcon or hawk to...
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- One source of confusion we frequently run across is the concept of speaker impedance. This confusion is also a likely cause of many blown power amplifiers. This article is intended to explain the meaning of speaker impedance and guide the reader in connecting multiple speakers to an amplifier.
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resistance A force, such as friction, that operates opposite the direction of motion of a body and tends to prevent or slow down the body's motion. A measure of the degree to which a substance impedes the flow of electric current induced by a voltage. Resistance is measured in ohms. Good conductors, such as copper, have low resistance. Good insulators, such as rubber, have high resistance.
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- The nominal impedance Z = 4, 8, and 16 ohms (loudspeakers) is often assumed as resistance R. Ohm's law equation (formula): V = I × R and the power law equation (formula): P = I × V. P = power, I or J = Latin: influare, international ampere, or intensity and R = resistance. V = voltage, electric potential difference δ V or E = electromotive force (emf = voltage).
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- • Impedance: Takes the complex form z = r + jx, where r (ohms) =. resistance, x (ohms) = reactance, j = √-1, & ohm = 1 V/A. • Admittance: Inverse of impedance. Takes the complex form. y 2= g + jb, where the conductance g is given by g = r/[r2 + x ] (mhos) and the susceptance b 2is given by b = -x/[r + x2] (mhos).
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What is electrical impedance? Impedance is a more general term for resistance that also includes reactance. In other words, resistance is the opposition to a steady electric current. Pure resistance does not change with frequency, and typically the only time only resistance is considered is with DC (direct current -- not changing) electricity.
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Bio-Electrical Impedance Analysis (BIA) - Body Mass Analysis Bio-electrical Impedance Analysis or Bioimpedance Analysis (BIA) is a method of assessing your body composition, the measurement of body fat in relation to lean body mass.It is an integral part of a health and nutrition assessment. Research has shown that body composition is directly related to health.io-electrical Impedance Analysis or Bioimpedance Analysis (BIA) is a method of assessing your body composition, the measurement of body fat in relation to lean body mass.
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- 1 By 10 months of age, a baby should be able to grasp objects with thumb and forefinger. 2  By twelve months of age, most babies will be crawling and trying to walk. 3  Parents should encourage crawling rather than early walking to help the child develop better eye-hand coordination.
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Definitions &Translations Wiktionary(0.00 / 0 votes)Rate this definition: 1  wiseguy(Noun) One who is insolent or flippant; one who makes jokes or perpetrates pranks. 2  wiseguy(Noun) A member of the Mafia or other organized crime organization.
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electricity Click the link for more information. is the unit of resistance, reactance, or impedance (see electric and magnetic unitselectric and magnetic units, units used to express the magnitudes of various quantities in electricity and magnetism.
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- Generally, it is desirable that the output impedance is low, and the destination impedance high, and this is the case with the majority of modern equipment. Preamps usually have an output impedance of less than 1k Ohm, and power amps will have an input impedance of at least 10k Ohms, but more commonly 22k or 47k.
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- impedancenoun [ U ] /ɪmˈpiː.dəns/ /ɪmˈpiː.dəns/ specialized. › the total resistance of electrical equipment to alternating current. Thesaurus: synonyms and related words. Electricity & electronics. anodize. anti-static. chargeable. charger.
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- Answer Wiki. Electrical impedance is the complex ratio of the voltage to the current in an alternating current (AC) circuit. Impedance extends the concept of resistance to AC circuits, and possesses both magnitude and phase, unlike resistance, which has only magnitude.
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- Becquey*, M. Lavergne*, and C. Willm*. Acoustic impedance, the product of seismic velocity and density, is a basic physical property of rocks. Seismic traces are converted into pseudoreflection-coefficient time series by appropriate initial processing. then into acoustic impedance by the inversion of the time series.
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- Impedance is the total opposition to the flow of electrical energy within the cable. It is a complex value defined by the cable’s resistance, capacitance, inductance, and conductance, and is the equivalent value of these items combined.G, or Radio Guide, is the manner that the military used to identify transmission lines. The RG number specified the physical construction, materials, physical, mechanical and electrical requirements of the cable.
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- Difference Between Impedance and Resistance. The differences between impedance and resistance: Resistance and impedance are two very important properties of components in circuit theory. This article will look into the key differences between impedance and resistance. Resistance is a very important property in the field of electricity and electronics.
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resistance 3. (Units). a. the opposition to a flow of electric current through a circuit component, medium, or substance. It is the magnitude of the real part of the impedance and is measured in ohms. Symbol: R Compare reactance 1. b. (as modifier): resistance coupling; a resistance thermometer. 4. (General Physics) any force that tends to retard or oppose motion: air resistance; wind resistance.
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Condom A female condom. A condom is a thin cover that is put on a man's penis and used during sexual intercourse. It is normally made of latex. Condoms are a form of birth control, they can prevent a pregnancy. They can also prevent the spread of certain sexually transmitted infections, such as gonorrhea, syphilis, or HIV.