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# Difference Between Active Power Reactive Power And Apparent Power Pdf

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## Active, Reactive and Apparent Power

Explore other articles on this topic. While current and voltage have stable values with direct current, the strength and the direction of both current flow and voltage change regularly in alternating current. In the utility grid, current and voltage have a sinusoidal progression, meaning that their product, electrical power, is also sinusoidal. In DC systems, the sign of the power indicates the direction in which the electrical energy, in the form of active power, is transported. In general, this also applies in an AC circuit. However, the power may not always be constantly positive or constantly negative, but rather its sign can fluctuate periodically, causing the power to oscillate back and forth.

Instantaneous power in an electric circuit is the rate of flow of energy past a given point of the circuit. In alternating current circuits, energy storage elements such as inductors and capacitors may result in periodic reversals of the direction of energy flow. The portion of power that, averaged over a complete cycle of the AC waveform , results in net transfer of energy in one direction is known as active power more commonly called real power to avoid ambiguity especially in discussions of loads with non-sinusoidal currents. The portion of power due to stored energy, which returns to the source in each cycle, is known as instantaneous reactive power , and its amplitude is the absolute value of reactive power. In a simple alternating current AC circuit consisting of a source and a linear load, both the current and voltage are sinusoidal.

We know that reactive loads such as inductors and capacitors dissipate zero power, yet the fact that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power. The mathematical symbol for reactive power is unfortunately the capital letter Q. The actual amount of power being used, or dissipated, in a circuit is called true power , and it is measured in watts symbolized by the capital letter P, as always. There are several power equations relating the three types of power to resistance, reactance, and impedance all using scalar quantities :. Please note that there are two equations each for the calculation of true and reactive power. True power, reactive power, and apparent power for a purely resistive load. True power, reactive power, and apparent power for a purely reactive load.

## Active, Reactive and Apparent Power

The required power supply is called the apparent power and is a complex value that can be expressed in a Pythagorean triangle relationship as indicated in the figure below. Apparent power is measured in volt-amperes VA - the AC system voltage multiplied with flowing current. Apparent power is a complex value and the vector sum of the active and reactive power as indicated in the figure above. Active - or Real or True - power do the actual work in the load. Active power is measured in watts W and is the power consumed by electrical resistance. Reactive power is the imaginary or complex power in a capacitive or inductive load.

It is measured in kilowatt kW or MW. It is the actual outcomes of the electrical system which runs the electric circuits or load. Definition: The power which flows back and forth that means it moves in both the directions in the circuit or reacts upon itself, is called Reactive Power. It has been seen that power is consumed only in resistance. A pure inductor and a pure capacitor do not consume any power since in a half cycle whatever power is received from the source by these components, the same power is returned to the source. This power which returns and flows in both the direction in the circuit, is called Reactive power. This reactive power does not perform any useful work in the circuit.

The most significant difference between the active and reactive power is that the active power is the actual power which is dissipated in the circuit. The other differences between the active and reactive power are explained below in the comparison chart. The right-angled triangle shown below shows the relation between the active, reactive and apparent power. Measures the power factor of the circuit. The power which is dissipated or do the useful work in the circuit is known as the active power. It is measured in watts or megawatts.

## True, Reactive, and Apparent Power

The main difference between active and reactive power is that Active Power is actual or real power which is used in the circuit while Reactive power bounce back and forth between load and source which is theoretically useless. The following power triangle shows the relation between Active, Reactive and Apparent Power. These all powers only induced in AC circuits when current is leading or lagging behind the voltage i.

We know that reactive loads such as inductors and capacitors dissipate zero power, yet the fact that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power. The actual amount of power being used, or dissipated, in a circuit is called true power , and it is measured in watts symbolized by the capital letter P, as always. There are several power equations relating the three types of power to resistance, reactance, and impedance all using scalar quantities :. True power, reactive power, and apparent power for a purely resistive load.

Стратмор откинул голову назад, словно давая каплям возможность смыть с него вину. Я из тех, кто добивается своей цели. Стратмор наклонился и, зачерпнув воды, смыл со своих рук частицы плоти Чатрукьяна. Его мечта о Цифровой крепости рухнула, и он полностью отдавал себе в этом отчет. Теперь у него осталась только Сьюзан.

ГЛАВА 81 С мутными слезящимися глазами Беккер стоял возле телефонной будки в зале аэровокзала. Несмотря на непрекращающееся жжение и тошноту, он пришел в хорошее расположение духа. Все закончилось. Действительно закончилось.

Не может быть, чтобы Грег Хейл был гарантом затеи Танкадо. Это полный абсурд. Танкадо ни за что не доверился бы Хейлу. - Коммандер, - напомнила Сьюзан, - Хейл однажды уже чуть не угробил нас - с Попрыгунчиком. Танкадо имел основания ему верить.

Уверен, ты догадаешься сама, - сказал Стратмор.  - Он не очень любит Агентство национальной безопасности. - Какая редкость! - саркастически парировала Сьюзан.

Шестиэтажная ракета содрогалась. Стратмор нетвердыми шагами двинулся к дрожащему корпусу и упал на колени, как грешник перед лицом рассерженного божества. Все предпринятые им меры оказались бесполезными.

Если кто-то имеет возможность читать его электронную почту, то и остальная информация на его компьютере становится доступной… - Переделка Цифровой крепости - чистое безумие! - кричал Хейл.  - Ты отлично понимаешь, что это за собой влечет - полный доступ АНБ к любой информации.  - Сирена заглушала его слова, но Хейл старался ее перекричать.

А это не так? - спросил Беккер холодно, глядя на ее припухший локоть. - Конечно, нет! - возмущенно ответила девушка. Она смотрела на него невинными глазами, и Беккер почувствовал, что она держит его за дурака.  - Да будет. На вид вы человек состоятельный.

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