Xem 1-20 trên 141 kết quả Alternating current
  • Resistors in an AC circuit, capacitors in an AC circuit, inductors in an AC circuit, the RLC series circuit, power in an ac circuit, resonance in a series rlc circuit, the transformer,... As the main contents of the document "Alternating current circuits and electromagnetic waves". Invite you to consult.

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  • The general topic of alternating current (AC) influence on the battery charging is necessarily a huge undertaking. The vast body of knowledge in electrochemical systems has been largely associated with direct current (DC) measurements. To place this into perspective, it helps to note that a DC can be considered a special case of an AC where the frequency of the AC is zero (or, as a practical matter, has a frequency having a very long period).

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  • Tham khảo tài liệu 'trắc nghiệm điện xoay chiều(ac:alternating current)(cb)', tài liệu phổ thông, ôn thi đh-cđ phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The main aim of our new book, as reflected in its title, is to consider the origins, development and current state of modern macroeconomics in a manner appropriate for intermediate undergraduates taking courses in macroeconomics. As such we have assumed that such students will already have a firm grasp of basic economic principles and be familiar with introductory macroeconomic theories and models as developed, for example, in textbooks such as those by Abel and Bernanke (2001), Blanchard (2003), or Mankiw (2003).

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  • Guided by Hippocrates' dictum, this book takes a scientific look at the current plethora of alternative treatments that are rapidly growing in popularity. These treatments are piled high in every pharmacy, written about in every magazine, discussed on millions of web pages and used by billions of people, yet they are regarded with scepticism by many doctors.

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  • If each voltage is connected to a circuit with the same power factor and the three currents return along the same conductor, then the vector sum of the three return currents is zero. Thus instead of three full sized return cables, only one of smaller size is needed. If none of the load is single phase, then the neutral is not needed at all. High voltage supplies are nearly always three phase without a neutral conductor. There is a great economy in distribution costs if the electricity can be supplied in three phases. ...

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  • Automatic Voltage Regulator adjusts the excitation so that at the system design power factor, the voltage is correct whatever the current. If however it adjusts the excitation to give the correct voltage at other power factors, then two machines will not run in parallel. One can supply a huge leading current and the other a huge lagging current. A “droop” is needed to give a lower voltage if the power factor lags by more than the system design. This is achieved by the compounding. Faulty Compounding causes unstable sharing of kVAr which can be quite violent....

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  • Your goals for this “merchandising” chapter are to learn about: Merchandising businesses and related sales recognition issues. Purchase recognition issues for the merchandising business. Alternative inventory system: The perpetual method. Enhancements of the income statement. The control structure.

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  • Alternative medicine is a term that causes confusion for most people. What is alternative medicine? How does it compare with conventional medicine? What is integrative medicine? Is integrative medicine the same as alternative medicine? How does alternative medicine compare with holistic health? What do all of these practices have in common, and what are their differences? Do they work? Are they safe? The reason most consumers choose to explore alternative approaches to healing is a very simple one: what they’re currently doing isn’t working.

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  • This informative new book explains, in meticulous detail, what is known scientifically about the effectiveness of complementary and alternative medicine therapies including nutritional, botanical, homeopathic and psychospiritual for HIV/AIDS. The special research methodology challenges involved in the scientific evaluation of complementary and alternative medicine are discussed in depth, and the authors offer valuable new insights into the complex pathogenesis of AIDS.

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  • After reading this chapter, you should be able to: Describe alternative perspectives on the causes of macroeconomic instability, including the views of mainstream economists, monetarists, real-business-cycle advocates, and proponents of coordination failures; explain what the equation of exchange is and how it relates to "monetarism"; discuss why new classical economists believe the economy will "self-correct" from aggregate demand and aggregate supply shocks; identify and describe the variations of the debate over "rules" versus "discretion" in conducting stabilization policy.

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  • Dòng điện xoay chiều là dòng điện có chiều và cường độ biến thiên theo thời gian. Dòng điện xoay chiều thường được tạo ra từ các máy phát điện xoay chiều hoặc được biến đổi từ nguồn điện một chiều bởi một mạch điện tử thường gọi là bộ nghịch lưu dùng các Thyristor. Trong kỹ thuật nguồn xoay chiều được ký hiệu là AC (viết tắt của Alternating Current) hoặc ký hiệu bởi hình ~ (dấu ngã - hình sin).

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  • Single-phase Motor Stator Stator động cơ 1 pha. Nếu chỉ có 1 cuộn dây nối vào 1 pha sẽ có từ trường xoay chiều như sau.. Không tạo ra được từ trường quay. Alternating Current Machines Stator động cơ 1 pha. Phần tĩnh gồm hai cuộn dây đặt lệch nhau 90 độ.

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  • The amount of knowledge an electrician must possess to be able to install and troubleshoot control systems in today’s industry has increased dramatically in recent years. A continuous influx of improved control components allows engineers and electricians to design and install even more sophisticated and complex control systems. Industrial Motor Control presents the solidstate devices common in an industrial environment.

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  • This publication deals primarily with small and medium-sized induction motors which are the most common type of alternating current motor. The combination of new materials and more sophisticated methods for calculation, design and production have made the modern three-phase induction motor a robust and reliable prime mover.

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  • AC/DC I/O interface. A discrete interface that converts alternating current (AC) voltages from field devices into direct current (DC) signals that the processor can use. It can also convert DC signals into proportional AC voltages. action. A set of control instructions prompting a PLC to perform a certain control function during the execution of a sequential function chart step. acyclic message. An unscheduled message transmission. A/D. See analog-to-digital converter. address. (1) The location in a computer’s memory where particular information is stored.

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  • In a normal alternating current power system, the voltage varies sinusoidally at a specific frequency, usually 50 or 60 hertz. When a linear electrical load is connected to the system, it draws a sinusoidal current at the same frequency as the voltage (though usually not in phase with the voltage). When a non-linear load, such as a rectifier, is connected to the system, it draws a current that is not necessarily sinusoidal. The current waveform can become quite complex, depending on the type of load and its interaction with other components of the system.

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  • Electromagnetism is fundamental to the whole of electrical and electronic engineering. It provides the basis for understanding the uses of electricity and for the design of the whole spectrum of devices from the largest turbo-alternators to the smallest microcircuits. This subject is a vital part of the education of electronic engineers. Without it they are limited to understanding electronic circuits in terms of the idealizations of circuit theory.

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  • The digital multimeter is a versatile testing and troubleshooting device. This lab covers both direct current (DC) and alternating current (AC) voltage measurements. Voltage is measured in either AC or DC volts, indicated by a V. Voltage is the pressure that moves electrons through a circuit from one place to another. Voltage differential is essential to the flow of electricity. The voltage differential between a cloud in the sky and the earth is what causes lightning to strike.

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  • . In the atomic-hydrogen process, an arc is established between two tungsten electrodes in a stream of hydrogen gas using alternating current. As the gas passes through the arc, molecular hydrogen is dissociated into atomic hydrogen under the intense heat. When the stream of hydrogen atoms strikes the workpiece, the environmental temperature is then at a level where recombining into molecules is possible. As a result of the recombining, the heat of dissociation absorbed in the arc is liberated, supplying the heat needed for fusing the base metal and any filler metal that may be introduced.

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