{"id":3951,"date":"2022-06-01T07:56:58","date_gmt":"2022-06-01T07:56:58","guid":{"rendered":"https:\/\/mdr.foobrdigital.com\/?p=3951"},"modified":"2022-06-01T07:56:58","modified_gmt":"2022-06-01T07:56:58","slug":"electrical-resistance","status":"publish","type":"post","link":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/2022\/06\/01\/electrical-resistance\/","title":{"rendered":"Electrical Resistance"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Resistance definition<\/h2>\n\n\n\n<p>Resistance is an electrical quantity that measures how the device or material reduces the&nbsp;<a href=\"https:\/\/www.rapidtables.com\/electric\/Current.html\">electric current<\/a>&nbsp;flow through it.<\/p>\n\n\n\n<p>The resistance is measured in units of&nbsp;<a href=\"https:\/\/www.rapidtables.com\/electric\/ohm.html\">ohms<\/a>&nbsp;(\u03a9).<\/p>\n\n\n\n<p>If we make an analogy to water flow in pipes, the resistance is bigger when the pipe is thinner, so the water flow is decreased.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a>Resistance calculation<\/h2>\n\n\n\n<p>The resistance of a conductor is resistivity of the conductor&#8217;s material times the conductor&#8217;s length divided by the conductor&#8217;s cross sectional area.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.rapidtables.com\/electric\/resistor\/resistance.GIF\" alt=\"R=\\rho \\times \\frac{l}{A}\"\/><\/figure>\n\n\n\n<p>R is the resistance in ohms (\u03a9).<\/p>\n\n\n\n<p>\u03c1is the resistivity in ohms-meter (\u03a9\u00d7m)<\/p>\n\n\n\n<p>l is the length of the conductor in meter (m)<\/p>\n\n\n\n<p>A is the cross sectional area of the conductor in square meters (m<sup>2<\/sup>)<\/p>\n\n\n\n<p>It is easy to understand this formula with water pipes analogy:<\/p>\n\n\n\n<ul><li>when the pipe is longer, the length is bigger and the resistance will increase.<\/li><li>when the pipe is wider, the cross sectional area is bigger and the resistance will decrease.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Resistance calculation with ohm&#8217;s law<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.rapidtables.com\/electric\/resistor\/ohmlaw.GIF\" alt=\"\"\/><\/figure>\n\n\n\n<p><em>R<\/em>&nbsp;is the resistance of the resistor in ohms (\u03a9).<\/p>\n\n\n\n<p><em>V<\/em>&nbsp;is the voltage drop on the resistor in volts (V).<\/p>\n\n\n\n<p><em>I<\/em>&nbsp;is the current of the resistor in amperes (A).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Temperature effects of resistance<\/h3>\n\n\n\n<p>The resistance of a resistor increases when temperature of the resistor increases.<\/p>\n\n\n\n<p><em>R<\/em><sub>2<\/sub>&nbsp;=&nbsp;<em>R<\/em><sub>1&nbsp;<\/sub>\u00d7&nbsp;( 1 + \u03b1(<em>T<\/em><sub>2&nbsp;<\/sub>&#8211;<em>&nbsp;T<\/em><sub>1<\/sub>) )<\/p>\n\n\n\n<p><em>R<\/em><sub>2<\/sub>&nbsp;is the resistance at temperature T<sub>2<\/sub>&nbsp;in ohms (\u03a9).<\/p>\n\n\n\n<p><em>R<\/em><sub>1<\/sub>&nbsp;is the resistance at temperature T<sub>1<\/sub>&nbsp;in ohms (\u03a9).<\/p>\n\n\n\n<p><em>\u03b1<\/em>&nbsp;is the temperature coefficient.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Resistance of resistors in series<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.rapidtables.com\/electric\/resistor\/series_resistors_circuit.GIF\" alt=\"\"\/><\/figure>\n\n\n\n<p>The total equivalent resistance of resistors in series is the sum of the resistance values:<\/p>\n\n\n\n<p><em>R<sub>Total<\/sub><\/em>&nbsp;=&nbsp;<em>R<\/em><sub>1<\/sub>+&nbsp;<em>R<\/em><sub>2<\/sub>+&nbsp;<em>R<\/em><sub>3<\/sub>+&#8230;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Resistance of resistors in parallel<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.rapidtables.com\/electric\/resistor\/parallel_resistors_circuit2.GIF\" alt=\"\"\/><\/figure>\n\n\n\n<p>The total equivalent resistance of resistors in parallel is given by:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.rapidtables.com\/electric\/resistor\/parallel_resistors.GIF\" alt=\"\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Measuring electrical resistance<\/h3>\n\n\n\n<p>Electrical resistance is measured with ohmmeter instrument.<\/p>\n\n\n\n<p>In order to measure the resistance of a resistor or a circuit, the circuit should have the power supply turned off.<\/p>\n\n\n\n<p>The ohmmeter should be connected to the two ends of the circuit so the resistance can be read.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Superconductivity<\/h3>\n\n\n\n<p>Superconductivity is the drop of resistance to zero at very low temperatures near 0\u00baK.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Resistance definition Resistance is an electrical quantity that measures how the device or material reduces the&nbsp;electric current&nbsp;flow through it. The resistance is measured in units of&nbsp;ohms&nbsp;(\u03a9). If we make an analogy to water flow in pipes, the resistance is bigger when the pipe is thinner, so the water flow is decreased. Resistance calculation The resistance [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[258],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/3951"}],"collection":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=3951"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/3951\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=3951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=3951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=3951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}