{"id":11415,"date":"2024-10-21T17:39:39","date_gmt":"2024-10-21T12:09:39","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=11415"},"modified":"2024-10-21T18:15:50","modified_gmt":"2024-10-21T12:45:50","slug":"ham-radio-exam-preparation-conductance-self-and-mutual-inductance","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/ham-radio-exam-preparation-conductance-self-and-mutual-inductance\/","title":{"rendered":"Ham Radio Exam Preparation: Conductance, Self and Mutual Inductance"},"content":{"rendered":"<p><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/7cSr0TeO94Y?si=5D0dLg6GZkkQE19N\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><br \/>\nThe ability of a conductor to allow free flow of electrons can be termed as conductance. It is the reciprocal of resistance and unit was called <em>mho<\/em>, which is ohm spelled backwards! Symbol was inverted ohm sign: \u2127. Conductance G is the inverse of resistance. If R is the resistance of a conductor, G is 1\/R mho. In the International System of Units (SI), the unit of electric conductance is <em>siemens<\/em>, represented by the symbol S. <em>Siemens<\/em> is also the unit for electric susceptance (reciprocal of reactance) and electric admittance (reciprocal of impedance), which were also represented by <em>mho<\/em>. Though the symbol is capital S, the name of the unit begins with lower case letter s! It has been mentioned that the SI term <em>siemens\u00a0<\/em>is used universally in science and often in electrical applications, while\u00a0<em>mho\u00a0<\/em>is still used in some electronic contexts.<\/p>\n<p>As discussed earlier, the property of a circuit or a component that opposes a change in current is inductance. Inductance is represented by L and the unit is henry (H). Lower values are mentioned as millihenry and microhenry, which will be equal to one by thousand henry and one by million henry respectively. Induction of a voltage within a coil by a change in electric current is known as self inductance. When another coil is placed near it, the magnetic flux produced by the current in the first coil can induce an electromotive force in the second coil. This is called mutual inductance and is the principle by which a transformer works. Fraction of magnetic flux linking between the\u00a0 coils is the coefficient of coupling between the coils and is denoted by the letter K. Maximum linkage possible is 1, when all the flux lines in L1, the first coil, links with L2, the second coil. Higher coefficient of coupling occurs when the coils are very close to each other. High coupling induces more voltage in the second coil while loose coupling or low coupling induces less voltage. When the coils are far apart to have no mutual inductance, then the coefficient of coupling will be zero.<\/p>\n<p>Transformers work by the principle of mutual inductance. If the number of turns in the primary winding of the transformer is n<sub>1<\/sub> and the number of turns in the secondary winding is n<sub>2<\/sub>, then the ratio of voltages V<sub>1<\/sub>\/V<sub>2<\/sub> will be equal to n<sub>1<\/sub>\/n<sub>2<\/sub>. If the number of turns in the primary is higher, it will act as a step-down transformer. When the number of turns in the primary is lower, it will act as a step-up transformer. Transformer works only on alternating current. If we want step up direct current voltages, we have to first convert the direct current to pulsating current using an oscillator. Then a step up transformer can be used to step up the voltage. Such a setup is often called an inverter and is commonly used in homes to provide alternate power supply from a large storage battery when the mains power fail. Inverter circuits are also built-into uninterruptible power supply or UPS, used for computers and other devices. Those devices generate high frequency alternating current in the process, to reduce the size of the transformer needed. Switch mode power supplies for amateur radios also work on a similar principle.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The ability of a conductor to allow free flow of electrons can be termed as conductance. It is the reciprocal of resistance and unit was called mho, which is ohm spelled backwards! Symbol was inverted ohm sign: \u2127. Conductance G is the inverse of resistance. If R is the resistance of a conductor, G is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11420,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-11415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ham Radio Exam Preparation: Conductance, Self and Mutual Inductance - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/ham-radio-exam-preparation-conductance-self-and-mutual-inductance\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ham Radio Exam Preparation: Conductance, Self and Mutual Inductance - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"The ability of a conductor to allow free flow of electrons can be termed as conductance. It is the reciprocal of resistance and unit was called mho, which is ohm spelled backwards! Symbol was inverted ohm sign: \u2127. Conductance G is the inverse of resistance. 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