Difference Between Ac And Dc Current In Hindi Pdf
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- AC और DC Current क्या है Mobile Phone में कौनसा Current Supply होता है ?
- What is the Difference Between AC and DC Currents
- What is the Difference Between AC and DC Welding?
- What is the Difference Between AC and DC Welding?
AC और DC Current क्या है Mobile Phone में कौनसा Current Supply होता है ?
Direct current DC is the one directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors , insulators , or even through a vacuum as in electron or ion beams.
The electric current flows in a constant direction, distinguishing it from alternating current AC. A term formerly used for this type of current was galvanic current. The abbreviations AC and DC are often used to mean simply alternating and direct , as when they modify current or voltage. Direct current may be converted from an alternating current supply by use of a rectifier , which contains electronic elements usually or electromechanical elements historically that allow current to flow only in one direction.
Direct current may be converted into alternating current via an inverter. Direct current has many uses, from the charging of batteries to large power supplies for electronic systems, motors, and more. Very large quantities of electrical energy provided via direct-current are used in smelting of aluminum and other electrochemical processes.
It is also used for some railways , especially in urban areas. High-voltage direct current is used to transmit large amounts of power from remote generation sites or to interconnect alternating current power grids. Direct current was produced in by Italian physicist Alessandro Volta 's battery, his Voltaic pile. The late s and early s saw electricity starting to be generated at power stations.
These were initially set up to power arc lighting a popular type of street lighting running on very high voltage usually higher than volt direct current or alternating current. Because of the significant advantages of alternating current over direct current in using transformers to raise and lower voltages to allow much longer transmission distances, direct current was replaced over the next few decades by alternating current in power delivery.
In the mids, high-voltage direct current transmission was developed, and is now an option instead of long-distance high voltage alternating current systems. For long distance underseas cables e. For applications requiring direct current, such as third rail power systems, alternating current is distributed to a substation, which utilizes a rectifier to convert the power to direct current. The term DC is used to refer to power systems that use only one polarity of voltage or current, and to refer to the constant, zero-frequency, or slowly varying local mean value of a voltage or current.
The DC solution of an electric circuit is the solution where all voltages and currents are constant. It can be shown that any stationary voltage or current waveform can be decomposed into a sum of a DC component and a zero-mean time-varying component; the DC component is defined to be the expected value, or the average value of the voltage or current over all time. Although DC stands for "direct current", DC often refers to "constant polarity".
Under this definition, DC voltages can vary in time, as seen in the raw output of a rectifier or the fluctuating voice signal on a telephone line. Some forms of DC such as that produced by a voltage regulator have almost no variations in voltage , but may still have variations in output power and current.
A direct current circuit is an electrical circuit that consists of any combination of constant voltage sources, constant current sources, and resistors. In this case, the circuit voltages and currents are independent of time. A particular circuit voltage or current does not depend on the past value of any circuit voltage or current. This implies that the system of equations that represent a DC circuit do not involve integrals or derivatives with respect to time.
If a capacitor or inductor is added to a DC circuit, the resulting circuit is not, strictly speaking, a DC circuit. However, most such circuits have a DC solution. This solution gives the circuit voltages and currents when the circuit is in DC steady state. Such a circuit is represented by a system of differential equations. The solution to these equations usually contain a time varying or transient part as well as constant or steady state part. It is this steady state part that is the DC solution.
There are some circuits that do not have a DC solution. Two simple examples are a constant current source connected to a capacitor and a constant voltage source connected to an inductor. In electronics, it is common to refer to a circuit that is powered by a DC voltage source such as a battery or the output of a DC power supply as a DC circuit even though what is meant is that the circuit is DC powered.
DC is commonly found in many extra-low voltage applications and some low-voltage applications, especially where these are powered by batteries or solar power systems since both can produce only DC. Most electronic circuits require a DC power supply.
Domestic DC installations usually have different types of sockets , connectors , switches , and fixtures from those suitable for alternating current. This is mostly due to the lower voltages used, resulting in higher currents to produce the same amount of power. It is usually important with a DC appliance to observe polarity, unless the device has a diode bridge to correct for this.
EMerge Alliance is the open industry association developing standards of DC power distribution in hybrid houses and commercial buildings. Most automotive applications use DC. An automotive battery provides power for engine starting, lighting, and ignition system.
The alternator is an AC device which uses a rectifier to produce DC for battery charging. Many heavy trucks, farm equipment, or earth moving equipment with Diesel engines use 24 volt systems. To save weight and wire, often the metal frame of the vehicle is connected to one pole of the battery and used as the return conductor in a circuit. Often the negative pole is the chassis "ground" connection, but positive ground may be used in some wheeled or marine vehicles.
The negative polarity is achieved by grounding the positive terminal of power supply system and the battery bank. This is done to prevent electrolysis depositions. Telephone installations have a battery system to ensure power is maintained for subscriber lines during power interruptions. Other devices may be powered from the telecommunications DC system using a DC-DC converter to provide any convenient voltage.
Many telephones connect to a twisted pair of wires, and use a bias tee to internally separate the AC component of the voltage between the two wires the audio signal from the DC component of the voltage between the two wires used to power the phone. High-voltage direct current HVDC electric power transmission systems use DC for the bulk transmission of electrical power, in contrast with the more common alternating current systems.
For long-distance transmission, HVDC systems may be less expensive and suffer lower electrical losses. Applications using fuel cells mixing hydrogen and oxygen together with a catalyst to produce electricity and water as byproducts also produce only DC. From Wikipedia, the free encyclopedia.
Unidirectional flow of electric charge. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Electrical network. Covariant formulation. Electromagnetic tensor stress—energy tensor.
Further information: History of electric power transmission. Main article: High-voltage direct current. Electronics portal Energy portal. Robinson, Lynn Snyder-Mackler Bhargava and D. Kulshrishtha Tata McGraw-Hill Education. Electrical meterman's handbook. Trow Press. Ohio History. Kent State University Press.
Ohio Historical Society. Archived from the original on Retrieved Amos, Geoffrey William Arnold Dummer Electric machines. Components and accessories. Alternator Electric generator. History, education, recreational use. Timeline of the electric motor Ball bearing motor Barlow's wheel Lynch motor Mendocino motor Mouse mill motor. Coilgun Railgun Superconducting machine. Blocked-rotor test Circle diagram Electromagnetism Open-circuit test Open-loop controller Power-to-weight ratio Two-phase system Inchworm motor Starter Voltage controller.
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Look up direct current in Wiktionary, the free dictionary.
What is the Difference Between AC and DC Currents
The conducting materials have free electrons which move from one atom to another when the potential difference is applied across them. This flow of electrons in a closed circuit is called current. On the basis of the direction of movement of electrons in a closed circuit, the electric current is mainly classified into two types, i. One of the major differences between the alternating and direct current is that in alternating current the polarity and the magnitude of the current changes at the regular interval of time whereas in direct current it remains constants. Some of the differences are explained below in the form of the comparison chart by considering the various factors;. Basis Alternating current Direct current Definition The direction of the current reverse periodically.
Electric current is a flow of electric charge through a conductive medium. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte. The reason of the charged particles movement is an electric voltage. Free charged particles move from places with high concentration to places with low concentration.
When the electricity was invented many changes have taken place over the years. The dark planet turned into a planet of lights. In fact, it made life so simple in all circumstances. All the devices, industries, offices, houses, technology, computers run on electricity. Here energy will be in two forms, i. Its properties are also discussed in a tabular column. The flow of electricity can be done in two ways like AC alternating current and DC direct current.
One of the major differences between the alternating and direct current is that in alternating current the polarity and the magnitude of the current changes at the.
What is the Difference Between AC and DC Welding?
The AC current changes its polarity and magnitude periodically and continuously with respect to time. The Ac current can be produced with a device named alternator that produces the alternating current. Suppose a piston is inserted inside a pipe and connected with a rotating rod as in the pin pic below. Here the piston has two strokes one towards upward and the other towards backward on the upward stroke, the water moves in a clockwise direction and the backward direction the water displaces in an anticlockwise direction so in this way water direction changes its direction periodically with oscillation of the piston. Every Ac Waveforms have a divider line or called the zero voltage line that divides the waveform two halves as the Ac current changes the magnitude and direction periodically so on every one complete cycle it reaches zero volts.
Direct current DC is the one directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors , insulators , or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current AC.
Most of the examples dealt with so far, and particularly those utilizing batteries, have constant voltage sources. Once the current is established, it is thus also a constant.
What is the Difference Between AC and DC Welding?
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Но, сеньор, она занята с клиентом. - Это очень важно, - извиняющимся тоном сказал Беккер. Вопрос национальной безопасности. Консьерж покачал головой: - Невозможно. Быть может, вы оставите… - Всего на одну минуту. Она в столовой.
Над Форт-Мидом высоко в небе сияла луна, и серебристый свет падал в окно, лишь подчеркивая спартанскую меблировку. Что же я делаю. - подумал Бринкерхофф. Мидж подошла к принтеру и, забрав распечатку очередности задач, попыталась просмотреть ее в темноте. - Ничего не вижу, - пожаловалась. - Включи свет. - Прочитаешь за дверью.
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В тридцати футах от них, скрытый за стеклом односторонней видимости Грег Хейл стоял у терминала Сьюзан.