什么是阻抗 具有电阻、电感和电容的电路里，对交流电所起的阻碍作用叫做阻抗。阻抗常用Z表示。阻抗由电阻、感抗和容抗三者组成，但不是三者简单相加。如果三者是串联的，又知道交流电的频率f、电阻R、电感L和电容C，那么串联电路的阻抗
阻抗的单位是欧。 对于一个具体电路，阻抗不是不变的，而是随着频率变化而变化。在电阻、电感和电容串联电路中，电路的阻抗一般来说比电阻大。也就是阻抗减小到最小值。在电感和电容并联电路中，谐振的时候阻抗增加到最大值，这和串联电路相反。 阻抗的相关资料: acoustic(al) impedance 声阻抗 acoustic driving-point impedance 声激励点阻抗 acoustic input impedance 声输入阻抗 acoustic wave impedance 声波阻抗 aerial impedance 天线阻抗 alternating current impedance 交流阻抗 anode-load impedance 阳极负载阻抗 antenna characteristic impedance 天线特性阻抗 antenna feed impedance 天线输入[馈电]阻抗 antenna input impedance 天线输入阻抗 antenna load impedance 天线负载阻抗 antenna mutual impedance 天线互阻抗 antenna output impedance 天线输出阻抗 antenna self-radiation impedance 天线自辐射阻抗 backward impedance 反向阻抗 balance-to-ground input impedance 对地平衡输入阻抗 balanced impedance 平衡[对称]阻抗 base impedance 天线座阻抗; 基极阻抗 beam loading impedance 射束负载阻抗 biasing impedance 偏压阻抗 bilateral impedance 双向阻抗 blocked impedance 阻挡阻抗, 固定阻抗 breakdown impedance 击穿阻抗 bridged impedance 桥接阻抗 capacitive impedance 电容性阻抗, 容抗 cathode coating impedance 阴极敷层阻抗 cathode interface impedance 阴极界面阻抗 cathode interlayer impedance 阴极层间阻抗 cavity impedance 腔阻抗 characteristic wave impedance 特性波阻抗 circuit impedance 电路阻抗 coil impedance 线圈阻抗 collector-base impedance 集电极-基极阻抗 combined impedance 合成阻抗 common impedance 公共阻抗 complex impedance 复数阻抗 computing impedance 计算阻抗 concentrated impedance 集中阻抗 condenser impedance 电容器阻抗 conjugate impedance 共轭阻抗 control impedance 控制阻抗 controllable impedance 可调电感 coupled impedance 耦合阻抗 crystal impedance 晶体阻抗 current limiting impedance 限流阻抗 cyclic impedance 相序阻抗 damped impedance 阻尼阻抗, 衰减阻抗 diaphragm impedance 膜片阻抗 diode forward impedance 二极管正向阻抗 direct-axis subtransient impedance 直轴超瞬变阻抗 dissymmetrical impedance 不对称阻抗 distribution impedance 分布阻抗 down lead impedance (天线)引下线阻抗 driving point impedance 驱动点阻抗, 输入阻抗 dynamic plate impedance 动态阳极阻抗 earth impedance 对地阻抗 effective impedance 有效阻抗 electric impedance 阻(电)抗, 电阻 electrode impedance 电极阻抗 equivalent impedance 等效阻抗 excitation impedance 励磁[激励]阻抗 external impedance 外阻抗 external plate impedance 板极电路阻抗 feedback impedance 反馈阻抗 feedpoint impedance 馈电点阻抗 free motional impedance 自由动态阻抗 free-space impedance 自由空间阻抗 gate impedance 控制极阻抗; 栅(极)阻抗 generalized impedance 广义阻抗 generator impedance 发生器阻抗 grid input impedance 栅极输入阻抗 guide characteristic wave impedance 波导管特性波阻抗 guide wave impedance 波导管阻抗 helix impedance 螺旋阻抗 high input impedance 高输入阻抗 hybrid equivalent impedance 混合等效输入阻抗 image impedance 对等阻抗, 对象阻抗 image-frequency impedance 镜频阻抗 impulsive impedance 脉冲阻抗 inductive impedance 电感性阻抗 input acoustic impedance 声输入阻抗 iterative impedance 累接[迭接]阻抗 internal output impedance 内输出阻抗, 实际输出阻抗 intrinsic impedance 固有阻抗 inverse impedance 逆[反]阻抗 layer impedance 层间阻抗 lead impedance 引线阻抗 leakage impedance 漏泄阻抗 line characteristic impedance 传输线特性阻抗 linear impedance 线性阻抗 load impedance (负)载阻抗 loop impedance 回线[环线]阻抗 lumped impedance 集总阻抗 matched impedance 匹配阻抗 mechanical impedance 机械阻抗; 力阻抗 mechanical rotational impedance 机械转动阻抗 medium impedance 中间阻抗 mesh impedance 网孔阻抗 microphone impedance 传声器阻抗 mid-series image impedance 串中剖镜象阻抗 motional impedance 动生阻抗 mutual radiation impedance 互辐射阻抗 natural impedance 特性阻抗, 波阻抗 natural acoustic impedance 固有声阻抗 negative sequence impedance 负序阻抗 network input impedance 网络输入阻抗 neuromuscular impedance 神经肌肉阻抗 no-load impedance 无载阻抗 nominal characteristic impedance 标称特性阻抗, 标称波阻抗 nominal earphone impedance 耳机标称阻抗 non-linear impedance 非线性阻抗 non-reactive impedance 无抗阻抗 normal impedance 标准阻抗 open circuit driving-point impedance 开路策动点阻抗, 开路输入阻抗 open-circuit impedance 开路阻抗 open-circuit transfer impedance 开路转移阻抗 open-loop output impedance 开环输出阻抗 optimum impedance 最佳阻抗 output impedance 出端阻抗 parallel resonance impedance 并联谐振阻抗 passive impedance 无源阻抗 phase -shifting impedance 相移阻抗 plate impedance 电子管内阻, 板极阻抗 plate-load impedance 板极负载阻抗 positive impedance 正阻抗 positive-phase sequence impedance 正相序阻抗 quadrature-axis synchronous impedance 交轴同步阻抗 radiation impedance 辐射阻抗 rated impedance 额定阻抗 reaction impedance 反应阻抗 receiving-end impedance 接收端阻抗 reciprocal impedance 互易阻抗 reciprocating impedance 倒易阻抗, 共轭阻抗 reduced impedance 折合[标称]阻抗 reflected impedance 反射阻抗 regenerative impedance 再生干扰 resonance impedance 谐振阻抗 resonant circuit impedance 谐振电路阻抗 resultant impedance 合成阻抗 reverse transfer impedance 反向转移阻抗 rotational impedance 转动阻抗 self-biasing impedance 自偏(压)阻抗 self-radiation impedance 自辐射阻抗 sending-end impedance 发送端阻抗 series impedance 串联阻抗 shielding impedance 屏蔽阻抗 short-circuit input impedance 短路输入阻抗 shunt negative impedance 并联负阻抗 single-ended input impedance 单端输入阻抗 source impedance 电源阻抗 speaker impedance 扬声器阻抗 specific impedance 比阻抗, 阻抗率 specific acoustic(al) impedance 比声阻抗 specific normal acoustic impedance 法向声阻抗率 speech impedance 语言电阻抗 spurious impedance 乱真阻抗, 寄生阻抗 static impedance 静电[静态]阻抗 stator impedance 定子阻抗 surface impedance 表面阻抗 surge impedance 波阻抗, 特性阻抗, 浪涌阻抗 symmetric impedance 对称阻抗 synchronous impedance 同步阻抗 terminal impedance 终端阻抗 time-variable impedance (随)时变(化)阻抗 total impedance 总阻抗 transfer impedance 传输阻抗 transistor input impedance 晶体管输入阻抗 transistor transfer impedance 晶体管转移阻抗 transmission -line impedance 传输线阻抗 tuned impedance 调谐阻抗 unilateral impedance 单向阻抗 unit area impedance 阻抗率 unit area acoustic impedance 单位面积声阻抗, 声阻抗率 vacuum tube impedance 电子管内阻抗 valve input impedance 电子管输入阻抗 variable load impedance 可变负载阻抗 vector impedance 矢量阻抗, 复(数)阻抗 virtual impedance 有效阻抗 wall impedance 墙壁声阻抗 wave impedance 波阻抗 waveguide impedance 波导阻抗 zero-phase sequence impedance 零相序阻抗 其它的语言介绍 中文(简体) 在传输的信号的由电阻，电感和电容造成的综合效应。阻抗以不同的频率变化。 jt-yobb.nease.net/JT_jscd3.htm 组抗电压从输出端子被送出的力量，及接受端子接受电压的：阻力量。相互应一致。 www.roland.com.cn/support/word/i.htm 中文(繁体） 在傳輸的信號的由電阻，電感和電容造成的綜合效應。阻抗以不同的頻率變化。 jt-yobb.nease.net/JT_jscd3.htm 組抗電壓從輸出端子被送出的力量，及接受端子接受電壓的：阻力量。相互應一致。 www.roland.com.cn/support/word/i.htm 俄语 полное сопротивление электрическому току. www.allacoustics.ru/dict_73.htm 法语 En régime sinusoïdal de tension et de courant, on appelle impédance d'un dipôle la valeur obtenue en divisant la valeur efficace de la tension aux bornes de ce dipôle par la valeur efficace du courant qui la traverse. Elle est généralement notée Z fr.wikipedia.org/wiki/Impedance Résistance en courant alternatif www.zikinf.com/dico/index.php Résistance au passage d'un courant à haute fréquence (pourrait être assimilée à l'inertie). C'est la source de nombreuses difficultés pour faire fonctionner une antenne correctement www.alyon.org/InfosTechniques/radio/glossaire_antennes.html Impédance. Impedance is similar to electrical resistance, in that it is a measure of the opposition to the flow of electricity. perso.wanadoo.fr/e-lektronik/LEKTRONIK/glossaire.htm L'impédance est exactement l'inverse d'une résistance (en électricité). Par analogie, on définit l'impédance acoustique : en électricité on a la loi d'ohm : U=RI ou Z = U/I avec Z=1/Rl'impédance. On fait correspondre la pression à la tension électrique U et la vitesse (du son) à l'intensité électrique (qui correspond elle au déplacement des électrons). L'impédance acoustique est donc le rapport de la pression sur la vitesse (du son ). www.cinenow.com/fr/lexique.php/i,I/ 英语 The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency. It is a combination of resistance R and reactance X, measured in ohms. www.indiantelevision.com/inforesources/tvglossary/i.htm 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. www.aventisav.com/AV%20Glossary.htm The opposition to electrical flow. www.angelfire.com/pa/baconbacon/page4.html (Z) Measured in ohms it is the total opposition to the flow of current offered by a circuit. Impedance consists of the vector sum of resistance and reactance.www.elkproducts.com/support/training/t6_electrical_terms.htm This is the total opposition to the current flow of an Alternating Current (AC) within a measured system. Impedance is measured in Ohms. www.songstuff.com/glossary/I The total opposition (ie resistance and reactance) a circuit offers to the flow of alternating current. It is measured in ohms, and the lower the ohmic value, the better the quality of the conductor. www.levitonvoicedata.com/learning/glossary.asp A measurement of the resistance to the flow of AC (which is what audio signals are); impedance is affected by resistance, capacitance, and inductance in a circuit and is also frequency dependent. Impedance is often mistaken for resistance and is also incorrectly thought of as being a measurement of the voltage from a pickup. In practical terms, you want low impedance sources feeding into high impedance loads; this gives maximum accuracy in signal transfer. ... www.seymourduncan.com/website/support/glossary.shtml A measurement of the resistance to the audio current by the voice coil of the speaker. www.precisionautosound.net/glossary.html The total opposition to the flow of alternating current in an electrical circuit. Impedance is measured in ohms. www.soundvideo.com/value_HTglossary.htm The opposition to the flow of an AC signal offered by a circuit or device. See also RF Impedance, Hi-Z, Lo-Z. www.kareoke.com/glossary/microphone_glossary_of_terms.htm A measurement of resistance to current that a transmission medium offers. It is measured in ohms. www.microsoft.com/technet/archive/wfw/7_agloss.mspx The opposition (measured in ohms) of circuit elements to an alternating current. The impedance includes both resistance and reactance. In an AC circuit, resistance presented to the current is a function of frequency, called impedance and is also measured in ohms. Ohm’s law can be used for AC if the reactances are zero, that is, if there are no capacitors or inductors in the circuit. See Appendix B. www.dilettantesdictionary.com/index.php A measure of the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance. www.tscmvideo.com/glossaryi.shtml Opposition or resistance to the flow of electrical current. The rated impedance of a loudspeaker is an average, since the impedance depends on the frequency of the signal. www.bext.com/glossary.htm The impedances of typical grounding electrode conductor wires linearly increase as a function of frequency. www.lightningsafety.com/nlsi_lhm/grounding_definitions.html Impedance is a measure of how hard a signal has to work to get thru a cable, speaker or piece of equipment. Always rated in Ohms, the higher the impedance, the harder for the signal to get thru. www.01xray.com/store/mic_glossary.htm The resistance to the flow of alternating current in a circuit. www.tecratools.com/pages/tecalert/lan_glossary.html acoustic impedance is the resistance of a medium to the propagation of sound, and is largely a function of density and the speed of sound in the medium. In a slightly different sense, it is a measure of the resistance of an interface to the propagation of sound from one medium to the next. See The Ear.www.palaeos.com/Vertebrates/Lists/Glossary/GlossaryHI.html A term in electronics which measures the amount of opposition a device has to an AC current (such as an audio signal). Technically speaking, it is the combined effect of capacitance, inductance, and resistance on a signal. www.mediacollege.com/glossary/i/ the opposition of an electronic component to the flow of current, measured in ohms. Most commonly thought of as a resistor, however, all devices have impedance associated with them. In transmission lines, it is a measure of the characteristic impedance of a cable, a PCB trace or an interconnect. The impedance of a transmission line (Z O ) is defined as: Z O = Ö(L/C), where C = capacitance and L = inductance. ... www.meritec.com/Pages/custom/glossary.html The total opposition to current flow presented by a component or a circuit. This may include any or all of the principles of INDUCTANCE, CAPACITANCE, or RESISTANCE. www.bugsweep.com/glossary.html Impedance is the opposition offered by a material to the flow of an electrical current and is a characteristic of AC systems. Impedance has two parts - resistance and reactance. Reactance has two components, capacitive reactance and inductive reactance. The properties of these last two components are dependent upon the frequency. www.sdge.com/business/elec_glossary.shtml Specifies the ratio of voltage to current (defined as a complex number R+jX in units of Ohms) www.dbmengineering.com/glossary.html Total opposition to current flow; includes resistance, capacitance and reactance. www.mytoolstore.com/ideal/glossary.html a property which is specific to Alternating Current (AC). It is like Resistance, but it varies with the AC frequency. For a maximum transfer for power, the source impedance and the terminating impedance should be equal. [Impedanz; impedance] www.internews.ru/books/radiohandbook/29.html electric resistance: a material's opposition to the flow of electric current; measured in ohms wordnet.princeton.edu/perl/webwn In electrical engineering, impedance is a measure for the manner and degree a component resists the flow of electrical current if a given voltage is applied. It is denoted by the symbol Z and is measured in ohms. Impedance differs from simple resistance in that it takes into account possible phase offset (see below). The concept of impedance also has significance outside of electrical systems in the discussion of any driven oscillator. In July of 1886, Oliver Heaviside coined this term. en.wikipedia.org/wiki/Impedance 葡萄牙语 Propriedade apresentada por um indutor ou capacitor de oferecer uma maior dificuldade à passagem de corrente alternada. Expressa-se em ohms, e varia com a freqüência da corrente alternada aplicada. Define as características de um circuito elétrico para "casar" aparelhos de entrada e saída de sinal e potência. www.mpc.com.br/audioespresso/gloss/i.htm |
