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<!--replace-end-7--><!--replace-end-4--><!--replace-end-1--></head><body><div class="ui fluid container universe"><!--replace-start-2--><!--replace-start-3--><!--replace-start-6--><div class="ui text container" id="zettel-container" style="position: relative"><div class="zettel-view"><article class="ui raised attached segment zettel-content"><div class="pandoc"><h1 id="title-h1">Relays</h1><p>A relay is an electrically operated switch.</p><p>It uses an electromagnet to mechancially operate a switch. A switch in one circuit can be used the trigger the operation of another circuit.</p><h2 id="core-components">Core components</h2><ul><li>electromagnet<ul><li>a coil of wire around an iron core</li></ul></li><li>armature<ul><li>a movable magnetic strip</li></ul></li><li>contacts<ul><li>electrical connections that can be open or closed</li></ul></li><li>spring<ul><li>returns the armature to its resting position when not energised</li></ul></li></ul><h2 id="operation">Operation</h2><p><img alt="Operation of a relay" src="/static/relay.gif" /></p><p>Current flows through the electromagnet which creates a magnetic field. This field attracts the armature which then moves to open or close the contacts. When the current stops, this returns the armature to its original position.</p><h2 id="usage">Usage</h2><p>During the <span class="zettel-link-container cf"><span class="zettel-link" title="Zettel: History of Computing (Swade, 2022 )"><a href="The_History_of_Computing_Swade.html">electro-mechanical era of computing</a></span></span> they were used as precursors to vacuum tubes (and later, transistors) to implement logic gates. While they were superseded in this domain, they are still used in industrial control systems and automobiles.</p></div></article><nav class="ui attached segment deemphasized backlinksPane" id="neuron-backlinks-pane"><h3 class="ui header">Backlinks</h3><ul class="backlinks"><li><span class="zettel-link-container cf"><span class="zettel-link"><a href="The_History_of_Computing_Swade.html">History of Computing (Swade, 2022 )</a></span></span><ul class="context-list" style="zoom: 85%;"><li class="item"><div class="pandoc"><span class="zettel-link-container cf"><span class="zettel-link" title="Zettel: Relays"><a href="Relays.html">relays</a></span></span> for logic operations</div></li></ul></li></ul></nav><nav class="ui attached segment deemphasized bottomPane" id="neuron-tags-pane"><div><span class="ui basic label zettel-tag" title="Tag">electronics</span></div></nav><nav class="ui bottom attached icon compact inverted menu blue" id="neuron-nav-bar"><!--replace-start-9--><!--replace-end-9--><a class="right item" href="impulse.html" title="Open Impulse"><i class="wave square icon"></i></a></nav></div></div><!--replace-end-6--><!--replace-end-3--><!--replace-end-2--><div class="ui center aligned container footer-version"><div class="ui tiny image"><a href="https://neuron.zettel.page"><img alt="logo" src="https://raw.githubusercontent.com/srid/neuron/master/assets/neuron.svg" title="Generated by Neuron 1.9.35.3" /></a></div></div></div></body></html> |