The unit of inductance is Henry (h). If a current with a rate of change of 1 amp/sec generates a back electromotive force (back voltage) of 1 volt, then the inductance of this device or circuit is 1 Henry.
When a coil can generate a magnetic flux of 1 W (Wb) through a current of 1 A, the inductance of this coil is 1 heng (h).
The units of inductance are milli-henries (mH) and micro-henries (μH).
1 constant = 10? Milli Heng = 10 6 micro Heng
The symbol of inductance is represented by capital L; ; The symbol similar to resistance is denoted by R.
※ ※ ※ ※ ※1,common terms about electricity in knowledge science ※ ※ ※ ※ ※
In terms of electricity, Watt and Volt are named after British scientist james watt (1736- 18 19) and Italian scientist Alessandro Volta (1745- 1827) respectively. The names of the two units can be abbreviated as W and V respectively; Derivative words such as kilowatt, kilovolt, megawatt and megavolt are all commonly used words. People are familiar with watt-hour meters, voltmeters and photovoltaic cells. Please look at the following example:
1. ampere is named after French scientist André-Marie Ampère (1775- 1836).
2. The resistance unit ohm is named after German scientist georg simon ohm (1787— 1854).
3. The inductance unit henry is named after the surname of American scientist joseph henry (1797- 1878).
4. Gauss, the unit of electromagnetic induction intensity, is named after the surname of German scientist Karl Flod Rich Gauss (1777— 1855).
5. The magnetic flux unit Weber is named after the surname of German scientist wilhelm eduard weber (1804— 189 1).
6. The unit of magnetic flux potential Gilbert is named after the surname of British scientist william Gilbert (1540-1603).
7. Maxwell, the unit of magnetic flux, was named after the surname of British scientist james clark Max Weil (183l- 1879).
8. The unit of magnetic field intensity, Oster, is named after the surname of Danish scientist hans christian oersted (1777 ~ 185 1).
9. Tesla, the unit of magnetic flux density, was named after American scientist nikola tesla (1856— 1943).
10. Faraday was named after British scientist michael faraday (1791-1867). His surname consists of many compound words: Faraday cage, Faraday barrel, Faraday effect, Faraday rotation and Faraday constant.
Newton, the unit of 1 1 Force, named after the surname of British physicist isaac newton (1642- 1727).
12. joule, the unit of energy and work, is named after the surname of British physicist James Prescott Joule (181889).
13. The radiation intensity unit Curie is named after the surname of Polish physicist Marie Curie (1867- 1934).
14. The unit of length Fermi is named after the surname of Italian physicist Enrico Fermi (1901-1954).
15. The wavelength unit angstrom (angstrom) of the spectral line is named after the surname of Swedish physicist Anders angstrom (1814-1874).
Pascal, the international pressure unit, is named after blaise pascal (1623- 1662), a French physicist.
17. Marchese Guillermo Marconi (1874-1937) is Italian. The wireless telegraph he invented added several words related to his surname to English: Marconi (wireless telegraph), marconigram (wireless telegraph) and marconigraph (wireless telegraph).
18. luigi galvani (1737- 1798) discovered bioelectricity when dissecting frogs. Many terms related to electricity come from his surname: galvanic (current), galvane (electricity), galvanim (volt) and galvanometer.
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※※ ※ ※ ※ ※ 2. ※ Introduction to Henry, a scientist named Inductive Components ※ ※ ※.
Joseph henry (1797 ~ 1878) is an American physicist. June 1797+February 200717 was born in a poor family in Albany, new york, USA. When Henry was a child, his father was ill for many years. In order to take care of his father, his mother had to send 6-year-old Henry to the countryside of Gorbi, more than 50 kilometers away, for his relatives to foster him. Henry dropped out of primary school in Gorby at the age of 10 and became an apprentice in a small village shop. Seeing that little Henry was clever, the boss liked him very much and let him go to work in the morning and study at school in the afternoon. Once, he went to the church to play and found a raised floor with a tunnel under it, which led directly to the church library. Henceforth, whenever he is free, Henry will get into the tunnel and go to the library to read. Later, when the shopkeeper found out, he simply took Henry to the main entrance to study and discussed the problem with him, which made Henry develop the good habit of self-study and research. Henry's father died at the age of 14, and he returned to his mother to learn from a watchmaker in Albany. His ambition is to become an actor and playwright. Mother rented out the extra room to make ends meet, and a tenant became Henry's good friend. Once, a tenant lent Henry a Gregory lecture on experimental science, astronomy and chemistry published in 1808. This book is rich in content and enlightening, which deeply attracts Henry. Since then, his interest has shifted, and he is determined to devote himself to natural science. /kloc-when he was 0/7 years old, Henry went to night school in Albany school, and it took only seven months to obtain the qualification of a rural primary school teacher. He teaches during the day and does research at night. Later, I worked in Albany College and often used my spare time in the laboratory to do some electrical experiments. Soon, he went to the Erie Canal site as a survey engineer. 1832, Henry was hired as a professor of natural philosophy at New Jersey College (now Princeton University). 1846, Henry was elected as the curator of the Smithsonian Museum in Washington. In the same year, Henry founded the Meteorological Bureau. 1867 was elected as the first president of the National Academy of Sciences.
Henry's main achievement in physics is his original research on electromagnetism.
1829, Henry improved the electromagnet invented by British inventor William sturgeon (1783 ~ 1850). He wrapped the wires with silk thread instead of the bare wires of Steggin, so that the wires were insulated from each other and wrapped several layers outside the iron block, which greatly enhanced the attraction of the electromagnet. The electromagnet originally made by Henry can absorb 300 kilograms of iron. Later, he made a small electromagnet that could absorb a ton of iron.
1829 In August, Henry made a comparative experiment on the lifting force of various electromagnets wound with wires of different lengths. He was surprised to find that when the current coil was disconnected, there was an electric spark. In August the following year, Henry studied this phenomenon again. 1832 published the paper "Electric Self-inductance in Long Spiral" and announced the discovery of electric self-inductance.
1830 In August, Henry placed a strip-shaped soft iron bar with wires wound between the two poles of the electromagnet, and then connected the wires on the strip-shaped iron bar to the galvanometer to form a closed loop. He observed that when the wire of the electromagnet was connected, the galvanometer pointer deviated to one side and returned to zero; When the wire is disconnected, the pointer deflects to the other side and returns to zero. This is the phenomenon of electromagnetic induction discovered by Henry. This was almost a year before Faraday's discovery. Unfortunately, Henry didn't publish his experimental results in time. Faraday not only reported his discovery in 183 1, but also summarized the law of electromagnetic induction in 185 1. So later generations attributed the priority of discovering electromagnetic induction to Faraday, and named the law of electromagnetic induction after Faraday.
1842, Henry installed a spark gap device in the laboratory and placed a coil 40 meters away to receive energy. The coil is connected with the galvanometer to form a loop. When the spark of the spark gap device flashes, the galvanometer pointer connected to the coil deflects. The success of this experiment actually realized the propagation of radio waves.
Although Henry's experiment was more than 40 years earlier than Hertz's, people at that time, including Henry himself, did not realize the importance of this experiment.
In addition, Henry invented the telegraph (1791~1871) before Morse, and successfully studied the problem of long-distance power transmission.
Henry made a lot of contributions, but it was not published immediately, so he lost the patent right of many inventions and the priority of discovery. But Henry is still recognized as a famous electrician. Henry died in Washington on May 1 0878 at the age of 8 1. In order to commemorate Henry, later generations specially named the unit of inductance after him, referred to as "balance".