impedance

简明释义

英[ɪmˈpiːdns]美[ɪmˈpiːdns]

n. [电] 阻抗

英英释义

单词用法

同义词

反义词

例句

1.In microwave circuit and aerial system, impedance matching is very important.

在微波电路和天线系统中，阻抗匹配是十分重要的问题。

2.If using a bioelectrical impedance scale, be sure to measure under the same circumstances each time.

如果是使用生物阻抗电子秤，确认每次是在同样的条件下。

3.Gold-plated: improve conductive contact impedance improve signal transmission.

镀金：改善导电接触阻抗，增进信号传输。

4.Lower source impedance to the switching power supply under test, thus it can deliver higher peak current.

对测试中开关电源提供更低的源阻抗﹐因此它会传送更高的峰值电流。

5.Impedance will reflect back as the square of the turns ratio.

阻抗将会按照匝比的平方反射回来。

6.High impedance is best defined as the level at which interferences cause significant errors.

对高阻的最好解释是干扰会引起明显误差的阻抗水平。

7."When you physically touch the antenna in that spot, you're changing the impedance characteristics of the antenna," said Banos.

“当你接触到天线上的那个信号衰减点的时候，就改变了天线的阻抗属性，”Banos说。

8.Do you perform the impedance test and your capability & frequency?please describe how to control impedance and retain the coupon sample.

是否有做阻抗测试?频率和能力如何?请描述你们怎样控制阻抗和保留的样品?。

9.The high impedance devices and signal sources must also be shielded.

高阻设备和信号源也必须是屏蔽的。

10.High impedance inputs are crucial for preventing loading effects in measurement devices.

高阻抗输入对于防止测量设备中的负载效应至关重要。

11.The impedance of a transmission line must be matched to prevent signal reflection.

传输线的阻抗必须匹配，以防止信号反射。

12.In audio systems, a mismatch in impedance can lead to poor sound quality.

在音频系统中，阻抗不匹配可能导致音质差。

13.The impedance of the circuit affects how much current flows through it.

电路的阻抗影响通过它的电流大小。

14.To measure the impedance of a speaker, you need a multimeter.

要测量扬声器的阻抗，你需要一个万用表。

作文

In the realm of electrical engineering, the term impedance refers to the measure of opposition that a circuit presents to the flow of alternating current (AC). It is a complex quantity that combines both resistance and reactance, which can significantly affect how electrical circuits operate. Understanding impedance is crucial for engineers and technicians who design and analyze electronic systems, as it plays a fundamental role in ensuring that circuits function efficiently and effectively.The concept of impedance can be likened to the resistance encountered when pushing water through a pipe. Just as a narrower pipe restricts water flow, higher impedance limits the flow of electrical current. However, unlike simple resistance, impedance also includes the effects of capacitors and inductors in the circuit, which introduce phase shifts between voltage and current. This means that even if the total impedance might be low, the actual power delivered to the load can vary significantly depending on the frequency of the AC signal.One of the most important aspects of impedance is its frequency dependence. In a circuit with inductors, the impedance increases with frequency due to the inductor's property of opposing changes in current. Conversely, capacitors exhibit a decrease in impedance with increasing frequency. This frequency-dependent behavior means that engineers must carefully consider the impedance at the operating frequency of the circuit to ensure optimal performance.In audio engineering, for example, matching the impedance of speakers and amplifiers is vital for achieving the best sound quality. If the impedance of the speaker is too low for the amplifier, it can lead to distortion or even damage the amplifier. Similarly, if the impedance is too high, the amplifier may not deliver sufficient power to drive the speaker effectively. Thus, understanding and managing impedance is essential for audio professionals to create high-fidelity sound systems.Moreover, impedance plays a critical role in telecommunications and signal transmission. When signals travel through transmission lines, mismatched impedance can cause reflections, leading to loss of signal integrity. Engineers utilize techniques such as impedance matching to minimize these reflections and ensure that signals can travel efficiently over long distances. This is particularly important in high-frequency applications, such as radio frequency (RF) communications, where even small mismatches can result in significant losses.In conclusion, impedance is a fundamental concept in electrical engineering that encompasses both resistance and reactance, influencing how circuits respond to alternating currents. Its frequency-dependent nature and significance in various applications, from audio systems to telecommunications, highlight the importance of understanding impedance for anyone involved in the field of electronics. By mastering this concept, engineers can design more effective and efficient systems that meet the demands of modern technology.

在电气工程领域，术语阻抗指的是电路对交流电（AC）流动所呈现的反对作用的度量。它是一个复杂的量，结合了电阻和电抗，这对电路的操作有显著影响。理解阻抗对设计和分析电子系统的工程师和技术人员至关重要，因为它在确保电路高效有效地运行中起着基础性作用。阻抗的概念可以比作推水通过管道时遇到的阻力。就像一根较窄的管道限制了水流一样，更高的阻抗限制了电流的流动。然而，与简单的电阻不同，阻抗还包括电路中电容器和电感器的影响，这会引入电压和电流之间的相位偏移。这意味着，即使总的阻抗可能很低，实际传递给负载的功率也可能因交流信号的频率而大相径庭。阻抗最重要的方面之一是其频率依赖性。在具有电感器的电路中，由于电感器抵制电流变化的特性，阻抗随频率的增加而增加。相反，电容器在频率增加时表现出阻抗的减少。这种频率依赖行为意味着工程师必须仔细考虑电路的工作频率下的阻抗，以确保最佳性能。例如，在音频工程中，扬声器和放大器的阻抗匹配对于实现最佳音质至关重要。如果扬声器的阻抗对放大器来说过低，可能会导致失真甚至损坏放大器。类似地，如果阻抗过高，放大器可能无法提供足够的功率来有效驱动扬声器。因此，理解和管理阻抗对于音频专业人士创建高保真音响系统至关重要。此外，阻抗在电信和信号传输中也起着关键作用。当信号通过传输线传播时，不匹配的阻抗可能导致反射，从而导致信号完整性的丧失。工程师利用诸如阻抗匹配等技术来最小化这些反射，确保信号能够高效地在长距离上传播。这在高频应用中尤为重要，例如无线电频率（RF）通信，甚至微小的不匹配都可能导致显著的损失。总之，阻抗是在电气工程中一个基本概念，它涵盖了电阻和电抗，影响电路对交流电的响应。其频率依赖性及其在各种应用中的重要性，从音频系统到电信，突显了理解阻抗对任何从事电子领域的人士的重要性。通过掌握这一概念，工程师可以设计出更有效和高效的系统，以满足现代技术的需求。