alternating current

简明释义

交流

英英释义

例句

1.Transformers are used to step up or step down the voltage of alternating current (交流电).

变压器用于升高或降低交流电 (交流电) 的电压。

2.Most household appliances operate on alternating current (交流电) to ensure safety and efficiency.

大多数家用电器使用交流电 (交流电) 以确保安全和效率。

3.Electric power plants generate alternating current (交流电) for transmission over long distances.

电力厂生成交流电 (交流电) 以便长距离传输。

4.The frequency of alternating current (交流电) in North America is typically 60 Hz.

北美的交流电 (交流电) 的频率通常为60赫兹。

5.Inverters convert direct current into alternating current (交流电) for use in homes.

逆变器将直流电转换为交流电 (交流电) 以供家庭使用。

作文

In the world of electricity, one of the most fundamental concepts is that of alternating current. This term refers to an electric current that reverses its direction periodically, contrasting with direct current (DC), which flows in a single direction. The significance of alternating current cannot be overstated, as it forms the backbone of our modern electrical systems. 交流电是指一种电流，它会周期性地改变方向，这与单向流动的直流电（DC）形成了鲜明的对比。Alternating current is primarily used for power distribution because it can be transmitted over long distances with minimal energy loss. This is largely due to the ability to easily transform voltages using transformers, allowing high voltages to be used for transmission and then reduced for safe use in homes and businesses.The invention of alternating current systems is credited to several inventors, but Nikola Tesla is often recognized as the pioneer who developed the technology that made it practical. His work in the late 19th century laid the foundation for the widespread adoption of alternating current in electrical grids around the world. Prior to Tesla's innovations, Thomas Edison championed direct current systems, which were limited in their efficiency for long-distance transmission. The rivalry between these two approaches, known as the "War of Currents," ultimately ended in favor of alternating current, primarily due to its advantages in scalability and safety.One of the key features of alternating current is its frequency, which is measured in hertz (Hz). In most countries, the standard frequency for household electricity is either 50 Hz or 60 Hz. This frequency denotes how many times the current changes direction per second. For instance, in a 60 Hz system, the current alternates direction 60 times every second. This rapid switching allows for efficient power delivery and is compatible with various electrical devices designed to operate on alternating current.Another important aspect of alternating current is its ability to generate electromagnetic fields, which are essential for the operation of many electrical devices. Motors, generators, and transformers all rely on alternating current to function effectively. For example, electric motors convert electrical energy into mechanical energy using the principles of electromagnetism, which are more efficiently harnessed with alternating current than with direct current.Despite its advantages, alternating current does have some drawbacks. One notable issue is the phenomenon known as "skin effect," where the current tends to flow near the surface of conductors at higher frequencies. This can lead to increased resistance and energy loss in certain applications. Additionally, while alternating current is more efficient for power transmission, it requires more complex circuitry for conversion to direct current for specific devices, such as batteries and electronics.In conclusion, alternating current plays a crucial role in modern society, powering everything from our homes to industries. Its ability to transmit electricity over long distances with minimal loss has revolutionized the way we generate and consume energy. As technology continues to advance, understanding the principles and applications of alternating current will remain essential for future innovations in electrical engineering. Overall, the study of alternating current not only highlights the history of electrical development but also underscores its importance in our daily lives.

在电力的世界中，最基本的概念之一就是交流电。这个术语指的是一种电流，它会周期性地改变方向，与单向流动的直流电（DC）形成对比。交流电的重要性不容小觑，因为它构成了我们现代电力系统的基础。交流电主要用于电力分配，因为它可以以最小的能量损失在长距离上传输。这主要归功于使用变压器轻松转换电压的能力，允许使用高电压进行传输，然后降低到家庭和企业安全使用的电压。交流电系统的发明归功于几位发明家，但尼古拉·特斯拉通常被认为是开发出使其可行的技术的先驱。他在19世纪末的工作为世界各地电网中交流电的广泛采用奠定了基础。在特斯拉的创新之前，托马斯·爱迪生支持直流电系统，这在长距离传输的效率上有限。这两种方法之间的竞争，被称为“电流之战”，最终以交流电的优势结束，主要由于其在规模化和安全性方面的优点。交流电的一个关键特征是其频率，以赫兹（Hz）为单位进行测量。在大多数国家，家庭电力的标准频率为50 Hz或60 Hz。这个频率表示电流每秒改变方向的次数。例如，在60 Hz的系统中，电流每秒改变方向60次。这种快速切换允许高效的电力传递，并与设计用于在交流电上工作的各种电气设备兼容。交流电的另一个重要方面是它能够产生电磁场，这对于许多电气设备的运行至关重要。电动机、发电机和变压器都依赖于交流电有效运作。例如，电动机利用电磁学原理将电能转化为机械能，这在使用交流电时更高效，而不是直流电。尽管有优势，交流电确实有一些缺点。其中一个显著问题是“表皮效应”，在较高频率下，电流倾向于在导体的表面流动。这可能导致某些应用中的电阻增加和能量损失。此外，虽然交流电在电力传输中更高效，但对于特定设备（如电池和电子设备）转换为直流电需要更复杂的电路。总之，交流电在现代社会中发挥着至关重要的作用，为我们的家庭和工业提供动力。它能够以最小的损失在长距离上传输电力，彻底改变了我们发电和消费能源的方式。随着技术的不断进步，理解交流电的原理和应用将对未来电气工程的创新至关重要。总体而言，对交流电的研究不仅突显了电力发展的历史，也强调了它在我们日常生活中的重要性。