{"id":57,"date":"2018-06-16T19:28:38","date_gmt":"2018-06-16T19:28:38","guid":{"rendered":"http:\/\/www.astill.org\/wp\/?p=57"},"modified":"2018-06-16T19:53:18","modified_gmt":"2018-06-16T19:53:18","slug":"electrical-applications-components-values-and-units","status":"publish","type":"post","link":"http:\/\/www.astill.org\/wp\/?p=57","title":{"rendered":"Electrical Applications, Components, Values and Units"},"content":{"rendered":"<p><strong>Resistors<\/strong><\/p>\n<p>https:\/\/en.wikipedia.org\/wiki\/Resistor<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/2\/26\/Resistor%2C_Rheostat_%28variable_resistor%29%2C_and_Potentiometer_symbols.svg\/180px-Resistor%2C_Rheostat_%28variable_resistor%29%2C_and_Potentiometer_symbols.svg.png\" width=\"180\" height=\"48\" \/>\u00a0<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/c\/c3\/Resistor_symbol_IEC.svg\/180px-Resistor_symbol_IEC.svg.png\" width=\"180\" height=\"60\" \/><\/p>\n<p>Resistors are measured in Ohms \u03a9. They are used to limit the current that flows through the circuit. Resistors mostly come in a fixed numeric.<\/p>\n<p>1, 1.5, 2, 2.2, 3.3, 4.7 and then multiples of that. e.g. 1.5k\u03a9, 2.2M\u03a9.<\/p>\n<p>The most basic algorithm used with resistors is Ohms law.<\/p>\n<p>v = i * r<\/p>\n<p>Voltage = Current * Resistance.<\/p>\n<p>For example if you have a 9v battery and a 1k\u03a9 (1000 ohms) resistor. The current drawn will be:<\/p>\n<p>i = v \/ r = 9 \/ 1000 = 9mA (9 milliamps).<\/p>\n<p>If this was in\u00a0 a simple circuit for lighting an LED it would limit the current and hence the brightness of the LED.<\/p>\n<p><a href=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/LEDwith1KResistor.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-65\" src=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/LEDwith1KResistor-251x300.png\" alt=\"\" width=\"251\" height=\"300\" srcset=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/LEDwith1KResistor-251x300.png 251w, http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/LEDwith1KResistor.png 534w\" sizes=\"auto, (max-width: 251px) 100vw, 251px\" \/><\/a><\/p>\n<p><strong>Capacitors<\/strong><\/p>\n<p>https:\/\/en.wikipedia.org\/wiki\/Capacitor<\/p>\n<p>Capacitors are measured in Farads (<\/p>\n<p><a href=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/capacitors.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-59\" src=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/capacitors-300x139.png\" alt=\"\" width=\"300\" height=\"139\" srcset=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/capacitors-300x139.png 300w, http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/capacitors-768x355.png 768w, http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/capacitors-1024x474.png 1024w, http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/capacitors.png 1280w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><strong>Transistors<\/strong><\/p>\n<p>https:\/\/en.wikipedia.org\/wiki\/Transistor<\/p>\n<p><a href=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/NPNandPNP.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-58\" src=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/NPNandPNP-300x152.png\" alt=\"\" width=\"300\" height=\"152\" srcset=\"http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/NPNandPNP-300x152.png 300w, http:\/\/www.astill.org\/wp\/wp-content\/uploads\/2018\/06\/NPNandPNP.png 486w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The two basic types of transistors we are covering are NPN and\u00a0PNP.<\/p>\n<p>Transistor act like switches. If there is a current applied to the base it turns the switch on or off depending on the type.<\/p>\n<p><strong>Diodes<\/strong><\/p>\n<p>https:\/\/en.wikipedia.org\/wiki\/Diode<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/b\/b4\/Diode_symbol.svg\/180px-Diode_symbol.svg.png\" width=\"180\" height=\"77\" \/><\/p>\n<p>Diodes allow current to pass in only one direction. This means that if they are connected the wrong way around, the the circuit will not work as you expect.<\/p>\n<p><strong>LEDs<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/e5\/LED_symbol.svg\/180px-LED_symbol.svg.png\" width=\"180\" height=\"56\" \/><\/p>\n<p>https:\/\/en.wikipedia.org\/wiki\/Light-emitting_diode<\/p>\n<p>Light Emitting Diodes. The symbol for an LED is the symbol for a diode with an added arrow.<\/p>\n<p>Like a diode, current can only pass in one direction through an LED. Unlike a diode, the LED emits light when current passes through it.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Resistors https:\/\/en.wikipedia.org\/wiki\/Resistor \u00a0 Resistors are measured in Ohms \u03a9. They are used to limit the current that flows through the&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,2],"tags":[],"class_list":["post-57","post","type-post","status-publish","format-standard","hentry","category-electrical-applications","category-tsa-ms"],"_links":{"self":[{"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=\/wp\/v2\/posts\/57","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=57"}],"version-history":[{"count":5,"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=\/wp\/v2\/posts\/57\/revisions"}],"predecessor-version":[{"id":67,"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=\/wp\/v2\/posts\/57\/revisions\/67"}],"wp:attachment":[{"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=57"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=57"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.astill.org\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=57"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}