An inductor is usually made from a coil of conducting material, like copper wire, that is then wrapped around a core made from either air or a magnetic metal. If you use a more magnetic material as the core, you can get the magnetic field around the inductor to be pushed in towards the inductor, giving it better inductance. Small inductors can also be put onto integrated circuits using the same ways that are used to make transistors. Aluminum is usually used as the conducting material in this case.
While a capacitor does not like changes in voltage, an inductor does not like changes in current.
In general, the relationship between the time-varying voltage "v"("t") across an inductor with inductance "L" and the time-varying current "i"("t") passing through it is described by the differential equation:
formula_1
Inductors are used often in analog circuits. Two or more inductors that have coupled magnetic flux make a transformer. Transformers are used in every power grid around the world.
Inductors are also used in electrical transmission systems, where they are used to lower the amount of voltage an electrical device gives off or lower the fault current.
Because inductors are heavier than other electrical components, people have been using them in electrical equipment less often.
Inductors with an iron core are used for audio equipment, power conditioning, inverter systems, rapid transit and industrial power supplies.
Electrical engineers like to reduce diagrams of electrical circuits, no matter how complicated, to an "equivalent circuit" consisting of a network of just "four" different types of component. These four basic components are "emfs", "resistors", "capacitors", and "inductors". An inductor is usually represented by a little solenoid in circuit diagrams. In practice, inductors generally consist of short air-cored solenoids wound from enameled copper wire.
Cast
Cast can mean:
In popular culture:
In music:
Other
Edward, the Black Prince
Edward, the Black Prince (Woodstock Palace, Oxfordshire, 15 June 1330 – Westminster Palace, 8 June 1376) was the eldest son of King Edward III of England.
Edward was born at Woodstock Palace, near Oxford. He was made Prince of Wales in 1343, and followed his father into battle against France. He became a famous soldier, helping win the Battle of Crécy and commanding the Battle of Poitiers. He was a founding member of the Order of the Garter. In 1361, he married his cousin, Joan of Kent. They had two sons, Edward and Richard. The older son, Edward, died when he was only six.
Edward of Woodstock has become known in history as "the Black Prince", but no one is quite sure of the reason for the nickname. He died at the age of 45, and was buried at the Canterbury Cathedral. As his father was still living, he never became king himself. He asked his father to give the title Prince of Wales to his son Richard, who later became King Richard II of England. .
Charles IV of France
Charles IV (18/19 June 1294 – 1 February 1328), was the King of France and Navarre (as Charles I) and Count of Champagne from 1322 to his death. Charles IV the last French king of the old Capetian line. He was crowned King of France in 1322 at the cathedral in Reims.
During his six years as king Charles IV raised taxes and took away land from people he did not like. In 1323 he made the Jews leave France because people thought they made secret plans with lepers and Muslims, although they did not really do those things.
Charles died without a son so there were questions about who would be the next king. He had two daughters, but the Salic law said daughters could not rule.
Edward III of England then believed he had the right to become the new king of France, that was the beginning of the Hundred Years' War.
Philip VI of France
Philip VI (1293 – 22 August 1350), called "the Fortunate", was King of France from 1328 to his death. He was also Count of Anjou, Maine, and Valois from 1325 to 1328. He was the first king from the House of Valois part of the Capetian dynasty.
UT
UT can mean many things:
Financial endowment
A financial endowment is money given to something to be saved in an investment. This is done so that the money will make a bigger difference when it is saved up over time.
Lisa Simpson
Lisa Marie Simpson is a character in the animated television series "The Simpsons". The person who does the voice for the character is Yeardley Smith. Matt Groening, the creator of the series, named her after his sister. She is the oldest daughter and middle child of Homer and Marge Simpson, and the sister of Bart and Maggie.
Lisa is an 8-year-old girl. She is one of the most intelligent characters on the series, with an I.Q. of either 156 or 159. She also plays the saxophone and is a vegetarian.
Despite her cleverness Lisa has typical childhood issues. For example, in the episode "Lost Our Lisa" she gets lost after riding the bus alone.
Farida Mammadova
Farida Mammadova (born 8 August 1936, Ali Bayramli) is an Azerbaijani historian who specialises in the history of ancient Caucasian Albania.
She is the author of numerous research papers, articles and books on Azerbaijani ancient and medieval history. She lectures at the Baku State University, Azerbaijan Pedagogical University. She is the head of the Department of Humanities in the Western University in Baku. Farida Mammadova works at the Institute of History of the National Academy of Sciences of Azerbaijan. In her research, she is known to be a disciple of the late Azerbaijani historian Ziya Bunyadov.
Her theories were criticized by foreign authors for the misinterpretation of historical sources and revisionism.
According to Thomas de Waal, Mammadova "have grasped the Albanian theory to supersede completely Armenians from Caucasus. She has placed the Caucasian Albania in territory of present Republic Armenia: all the territories, churches and monasteries in Republic Armenia have appeared Albanian". He describes Mammadova's theories as "an improved version of what became a very rough tool in Azerbaijan".
During her interviews Mammadova has made anti-Armenian statements:
And, it is known, that on whole planet exactly the Armenian people is distinguished by the absence of spiritual and other human values.
In the world there are only two nations that have national identity, but have not statehood. They are Jews and Armenians. The difference is that Jews have created their state on their historical homeland, and Armenians have created their state not on their historical native land.
Ibadi
The Ibāḍī (Arabic: Al-Ibādhiyyah الاباضية) is a denomination of Islam that is the dominant form in only one country, Oman. There are other Ibāḍī in Algeria and Libya. The Ibāḍī probably started one of the earliest schools, which was founded less than 50 years after the death of Muhammad.
The name comes from Abdullah ibn Ibadh at-Tamini. Some of the branch's followers, however, claim that its true founder was Jabir ibn Zaid al-'Azdi, who was from Nizwa, Oman.
Ibāḍī communities are generally seen as conservative. For example, they reject the practice of "qunūt" in which one asks Allah for things while one stands in prayer. Sunni Muslims traditionally consider the Ibāḍī to be an extremist Kharijite group because they came from that group. However, most Ibāḍī now believe that other Muslims are not "kuffar" "unbelievers", unlike most Kharijite groups, but "kuffar an-nima" "unbelievers in God's grace." Most Ibāḍī now believe a true believer's attitude to others to be expressed in three religious obligations:
Unlike the Kharijites, the Ibāḍī have abandoned the assassination of mainstream Muslims.
The Ibāḍī agree with Sunnis in approving of Caliphs Abū Bakr and Umar ibn al-Khattab, and both groups regarded them as rightly-guided caliphs. However, the Ibāḍī think that Uthman ibn Affan introduced "bid'ah" "innovations" to Islam and so approve of the revolt that overthrew him.