alternating current (a.c.)

简明释义

交流电流

英英释义

例句

1.Electricians often prefer alternating current (a.c.) 交流电 for wiring homes because it is safer for residential use.

电工通常更喜欢在家庭布线中使用alternating current (a.c.) 交流电，因为它对住宅使用更安全。

2.In many countries, the standard frequency for alternating current (a.c.) 交流电 is 50 or 60 Hz.

在许多国家，标准的alternating current (a.c.) 交流电频率为50或60赫兹。

3.The power grid distributes alternating current (a.c.) 交流电 to homes and businesses across the country.

电网将alternating current (a.c.) 交流电分配给全国各地的家庭和企业。

4.Transformers are used to change the voltage of alternating current (a.c.) 交流电 for long-distance transmission.

变压器用于改变alternating current (a.c.) 交流电的电压，以便进行远距离传输。

5.Most household appliances operate on alternating current (a.c.) 交流电 to ensure efficient power usage.

大多数家用电器使用alternating current (a.c.) 交流电以确保高效的电力使用。

作文

Understanding the concept of alternating current (a.c.) is crucial in the field of electrical engineering and everyday life. Alternating current (a.c.) refers to an electric current that periodically reverses direction, contrasting with direct current (d.c.), which flows in a single direction. The significance of alternating current (a.c.) lies not only in its widespread use but also in its efficiency for power distribution over long distances.One of the primary advantages of alternating current (a.c.) is its ability to be transformed to higher or lower voltages using transformers. This feature is particularly important in power transmission systems. When electricity is generated at power plants, it is often produced as alternating current (a.c.). By increasing the voltage, the current can travel long distances with minimal energy loss. Once it reaches the vicinity of consumers, the voltage can be decreased to safer levels suitable for residential or commercial use.The history of alternating current (a.c.) dates back to the late 19th century when inventors like Nikola Tesla and George Westinghouse advocated for its use over direct current (d.c.). Their efforts culminated in the 'War of Currents,' a pivotal moment in electrical history. Ultimately, alternating current (a.c.) became the dominant form of electricity used in homes and industries around the world.In addition to its practical applications, alternating current (a.c.) also has interesting properties that can be analyzed mathematically. For instance, the waveform of alternating current (a.c.) is typically sinusoidal, meaning it follows a smooth, repetitive oscillation. This sinusoidal nature allows engineers to calculate various parameters such as peak voltage, root mean square (RMS) voltage, and frequency, which are essential for designing electrical systems.Moreover, the use of alternating current (a.c.) is not limited to just power transmission. It also plays a vital role in the functioning of electric motors, generators, and transformers. Many household appliances, such as refrigerators, air conditioners, and washing machines, operate on alternating current (a.c.), making it an integral part of modern life.Despite its advantages, alternating current (a.c.) also comes with challenges. For example, the presence of harmonics in alternating current (a.c.) systems can lead to inefficiencies and overheating in electrical equipment. Engineers must design systems that minimize these issues to ensure optimal performance.In conclusion, the understanding of alternating current (a.c.) is essential for anyone involved in electrical engineering or even those who simply wish to comprehend how the electricity in their homes works. Its historical significance, practical applications, and unique properties make it a fascinating subject worthy of study. As technology continues to advance, the principles of alternating current (a.c.) will undoubtedly remain relevant, driving innovations in energy production and consumption for years to come.

理解交流电（a.c.）的概念在电气工程和日常生活中至关重要。交流电（a.c.）指的是一种电流，其方向周期性地反转，与单向流动的直流电（d.c.）形成对比。交流电（a.c.）的重要性不仅在于其广泛使用，还在于其在远距离电力分配中的效率。交流电（a.c.）的主要优点之一是它能够通过变压器将电压升高或降低。这一特性在电力传输系统中尤为重要。当电力在发电厂生成时，通常以交流电（a.c.）的形式产生。通过提高电压，电流可以在长距离内以最小的能量损失进行传输。一旦到达消费者附近，电压可以降低到适合住宅或商业使用的安全水平。交流电（a.c.）的历史可以追溯到19世纪末，当时尼古拉·特斯拉和乔治·威斯汀豪斯等发明家倡导其相对于直流电（d.c.）的使用。他们的努力 culminated 在“电流战争”中，这是电气历史上的一个重要时刻。最终，交流电（a.c.）成为全球家庭和工业中使用的主要电力形式。除了实际应用外，交流电（a.c.）还具有一些有趣的特性，可以通过数学分析。例如，交流电（a.c.）的波形通常是正弦波，这意味着它遵循平滑的、重复的振荡。这种正弦性质使工程师能够计算各种参数，如峰值电压、有效值（RMS）电压和频率，这些参数对于设计电气系统至关重要。此外，交流电（a.c.）的使用不仅限于电力传输。它在电动机、发电机和变压器的功能中也扮演着重要角色。许多家用电器，如冰箱、空调和洗衣机，都是在交流电（a.c.）下运行的，这使其成为现代生活中不可或缺的一部分。尽管有其优势，交流电（a.c.）也面临挑战。例如，交流电（a.c.）系统中谐波的存在可能导致电气设备的低效和过热。工程师必须设计系统以最小化这些问题，以确保最佳性能。总之，理解交流电（a.c.）对于任何从事电气工程或仅仅想理解其家庭电力工作原理的人来说都是至关重要的。其历史意义、实际应用和独特特性使其成为一个值得研究的迷人主题。随着科技的不断进步，交流电（a.c.）的原理无疑将继续保持相关性，推动未来数年的能源生产和消费创新。