具有電阻、電感和電容的電路里，對(duì)交流電所起的阻礙作用叫做阻抗。阻抗常用Z表示。阻抗由電阻、感抗和容抗三者組成，但不是三者簡(jiǎn)單相加。如果三者是串聯(lián)的，又知道交流電的頻率f、電阻R、電感L和電容C，那么串聯(lián)電路的阻抗

阻抗的單位是歐。
對(duì)于一個(gè)具體電路，阻抗不是不變的，而是隨著頻率變化而變化。在電阻、電感和電容串聯(lián)電路中，電路的阻抗一般來(lái)說(shuō)比電阻大。也就是阻抗減小到最小值。在電感和電容并聯(lián)電路中，諧振的時(shí)候阻抗增加到最大值，這和串聯(lián)電路相反。
阻抗的相關(guān)資料:
acoustic(al) impedance
聲阻抗
acoustic driving-point impedance
聲激勵(lì)點(diǎn)阻抗
acoustic input impedance
聲輸入阻抗
acoustic wave impedance
聲波阻抗
aerial impedance
天線阻抗
alternating current impedance
交流阻抗
anode-load impedance
陽(yáng)極負(fù)載阻抗
antenna characteristic impedance
天線特性阻抗
antenna feed impedance
天線輸入[饋電]阻抗
antenna input impedance
天線輸入阻抗
antenna load impedance
天線負(fù)載阻抗
antenna mutual impedance
天線互阻抗
antenna output impedance
天線輸出阻抗
antenna self-radiation impedance
天線自輻射阻抗
backward impedance
反向阻抗
balance-to-ground input impedance
對(duì)地平衡輸入阻抗
balanced impedance
平衡[對(duì)稱(chēng)]阻抗
base impedance
天線座阻抗; 基極阻抗
beam loading impedance
射束負(fù)載阻抗
biasing impedance
偏壓阻抗
bilateral impedance
雙向阻抗
blocked impedance
阻擋阻抗, 固定阻抗
breakdown impedance
擊穿阻抗
bridged impedance
橋接阻抗
capacitive impedance
電容性阻抗, 容抗
cathode coating impedance
陰極敷層阻抗
cathode interface impedance
陰極界面阻抗
cathode interlayer impedance
陰極層間阻抗
cavity impedance
腔阻抗
characteristic wave impedance
特性波阻抗
circuit impedance
電路阻抗
coil impedance
線圈阻抗
collector-base impedance
集電極-基極阻抗
combined impedance
合成阻抗
common impedance
公共阻抗
complex impedance
復(fù)數(shù)阻抗
computing impedance
計(jì)算阻抗
concentrated impedance
集中阻抗
condenser impedance
電容器阻抗
conjugate impedance
共軛阻抗
control impedance
控制阻抗
controllable impedance
可調(diào)電感
coupled impedance
耦合阻抗
crystal impedance
晶體阻抗
current limiting impedance
限流阻抗
cyclic impedance
相序阻抗
damped impedance
阻尼阻抗, 衰減阻抗
diaphragm impedance
膜片阻抗
diode forward impedance
二極管正向阻抗
direct-axis subtransient impedance
直軸超瞬變阻抗
dissymmetrical impedance
不對(duì)稱(chēng)阻抗
distribution impedance
分布阻抗
down lead impedance
(天線)引下線阻抗
driving point impedance
驅(qū)動(dòng)點(diǎn)阻抗, 輸入阻抗
dynamic plate impedance
動(dòng)態(tài)陽(yáng)極阻抗
earth impedance
對(duì)地阻抗
effective impedance
有效阻抗
electric impedance
阻(電)抗, 電阻
electrode impedance
電極阻抗
equivalent impedance
等效阻抗
excitation impedance
勵(lì)磁[激勵(lì)]阻抗
external impedance
外阻抗
external plate impedance
板極電路阻抗
feedback impedance
反饋?zhàn)杩?
feedpoint impedance
饋電點(diǎn)阻抗
free motional impedance
自由動(dòng)態(tài)阻抗
free-space impedance
自由空間阻抗
gate impedance
控制極阻抗; 柵(極)阻抗
generalized impedance
廣義阻抗
generator impedance
發(fā)生器阻抗
grid input impedance
柵極輸入阻抗
guide characteristic wave impedance
波導(dǎo)管特性波阻抗
guide wave impedance
波導(dǎo)管阻抗
helix impedance
螺旋阻抗

high input impedance
高輸入阻抗
hybrid equivalent impedance
混合等效輸入阻抗
image impedance
對(duì)等阻抗, 對(duì)象阻抗
image-frequency impedance
鏡頻阻抗
impulsive impedance
脈沖阻抗
inductive impedance
電感性阻抗
input acoustic impedance
聲輸入阻抗
iterative impedance
累接[迭接]阻抗
internal output impedance
內(nèi)輸出阻抗, 實(shí)際輸出阻抗
intrinsic impedance
固有阻抗
inverse impedance
逆[反]阻抗
layer impedance
層間阻抗
lead impedance
引線阻抗
leakage impedance
漏泄阻抗
line characteristic impedance
傳輸線特性阻抗
linear impedance
線性阻抗
load impedance
(負(fù))載阻抗
loop impedance
回線[環(huán)線]阻抗
lumped impedance
集總阻抗
matched impedance
匹配阻抗
mechanical impedance
機(jī)械阻抗; 力阻抗
mechanical rotational impedance
機(jī)械轉(zhuǎn)動(dòng)阻抗
medium impedance
中間阻抗
mesh impedance
網(wǎng)孔阻抗
microphone impedance
傳聲器阻抗
mid-series image impedance
串中剖鏡象阻抗
motional impedance
動(dòng)生阻抗
mutual radiation impedance
互輻射阻抗
natural impedance
特性阻抗, 波阻抗
natural acoustic impedance
固有聲阻抗
negative sequence impedance
負(fù)序阻抗
network input impedance
網(wǎng)絡(luò)輸入阻抗
neuromuscular impedance
神經(jīng)肌肉阻抗
no-load impedance
無(wú)載阻抗
nominal characteristic impedance
標(biāo)稱(chēng)特性阻抗, 標(biāo)稱(chēng)波阻抗
nominal earphone impedance
耳機(jī)標(biāo)稱(chēng)阻抗
non-linear impedance
非線性阻抗
non-reactive impedance
無(wú)抗阻抗
normal impedance
標(biāo)準(zhǔn)阻抗
open circuit driving-point impedance
開(kāi)路策動(dòng)點(diǎn)阻抗, 開(kāi)路輸入阻抗
open-circuit impedance
開(kāi)路阻抗
open-circuit transfer impedance
開(kāi)路轉(zhuǎn)移阻抗
open-loop output impedance
開(kāi)環(huán)輸出阻抗
optimum impedance
最佳阻抗
output impedance
出端阻抗
parallel resonance impedance
并聯(lián)諧振阻抗
passive impedance
無(wú)源阻抗
phase -shifting impedance
相移阻抗
plate impedance
電子管內(nèi)阻, 板極阻抗
plate-load impedance
板極負(fù)載阻抗
positive impedance
正阻抗
positive-phase sequence impedance
正相序阻抗
quadrature-axis synchronous impedance
交軸同步阻抗
radiation impedance
輻射阻抗
rated impedance
額定阻抗
reaction impedance
反應(yīng)阻抗
receiving-end impedance
接收端阻抗
reciprocal impedance
互易阻抗
reciprocating impedance
倒易阻抗, 共軛阻抗
reduced impedance
折合[標(biāo)稱(chēng)]阻抗
reflected impedance
反射阻抗
regenerative impedance
再生干擾
resonance impedance
諧振阻抗
resonant circuit impedance
諧振電路阻抗
resultant impedance
合成阻抗
reverse transfer impedance
反向轉(zhuǎn)移阻抗
rotational impedance
轉(zhuǎn)動(dòng)阻抗
self-biasing impedance
自偏(壓)阻抗
self-radiation impedance
自輻射阻抗
sending-end impedance
發(fā)送端阻抗
series impedance
串聯(lián)阻抗
shielding impedance
屏蔽阻抗
short-circuit input impedance
短路輸入阻抗
shunt negative impedance
并聯(lián)負(fù)阻抗
single-ended input impedance
單端輸入阻抗
source impedance
電源阻抗
speaker impedance
揚(yáng)聲器阻抗
specific impedance
比阻抗, 阻抗率
specific acoustic(al) impedance
比聲阻抗
specific normal acoustic impedance
法向聲阻抗率
speech impedance
語(yǔ)言電阻抗
spurious impedance
亂真阻抗, 寄生阻抗
static impedance
靜電[靜態(tài)]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
對(duì)稱(chēng)阻抗
synchronous impedance
同步阻抗
terminal impedance
終端阻抗
time-variable impedance
(隨)時(shí)變(化)阻抗
total impedance
總阻抗
transfer impedance
傳輸阻抗
transistor input impedance
晶體管輸入阻抗
transistor transfer impedance

晶體管轉(zhuǎn)移阻抗
transmission -line impedance
傳輸線阻抗
tuned impedance
調(diào)諧阻抗
unilateral impedance
單向阻抗
unit area impedance
阻抗率
unit area acoustic impedance
單位面積聲阻抗, 聲阻抗率
vacuum tube impedance
電子管內(nèi)阻抗
valve input impedance
電子管輸入阻抗
variable load impedance
可變負(fù)載阻抗
vector impedance
矢量阻抗, 復(fù)(數(shù))阻抗
virtual impedance
有效阻抗
wall impedance
墻壁聲阻抗
wave impedance
波阻抗
waveguide impedance
波導(dǎo)阻抗
zero-phase sequence impedance
零相序阻抗
其它的語(yǔ)言介紹