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id="content" class="site-content clr"> <article id="post-3039"> <header class="entry-header clr"> <h1 class="single-post-title entry-title" itemprop="headline">Transformer turns ratio calculator online</h1> </header> <div class="entry-content clr" itemprop="text"> <div class="code-block code-block-2" style="margin: 8px 0; clear: both;">   <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-4567036280313464" data-ad-slot="7226276104" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> <p>The primary function of a power transformer is to step up or step down voltage as per the requirement. The magnitude of voltage transformation in a transformer depends on its turns ratio. The output voltage of any<a href="/web/20210603060842/https://www.electricalclassroom.com/electric-transformers/"> transformer</a> can be theoretically calculated from its turns ratio. Use the following transformer turns ratio calculator for turns ratio calculation.</p> <hr class="wp-block-separator has-text-color has-background has-very-dark-gray-background-color has-very-dark-gray-color"/> <div class="wp-block-columns"> <div class="wp-block-column"> <div class="wp-block-group has-light-green-cyan-background-color has-background"><div class="wp-block-group__inner-container"> <h2>Online turns ratio calculator</h2> <strong>Calculate using</strong><select id="option" onchange="myFunction2()" style="background:yellow; width:auto;"> <option value="0">Select</option> <option value="1">Voltage</option> <option value="2">Turns</option> <option value="3">Current</option> </select> <table> <tbody><tr id="volt1" style="display: none;"><td>Primary Voltage:</td><td><input id="pv" type="number"/> </td><td> volts</td></tr> <tr id="volt2" style="display: none;"><td>Secondary Voltage:</td><td><input id="sv" type="number"/> </td><td> volts </td></tr> <tr id="turn1" style="display: none;"><td>Primary turns:</td><td><input id="pt" type="number"/> </td><td> turns</td></tr> <tr id="turn2" style="display: none;"><td>Secondary turns:</td><td><input id="st" type="number"/> </td><td> turns </td></tr> <tr id="amp1" style="display: none;"><td>Primary Current:</td><td><input id="pi" type="number"/> </td><td> amperes </td></tr> <tr id="amp2" style="display: none;"><td>Secondary Current:</td><td><input id="si" type="number"/> </td><td> amperes </td></tr> <tr id="but" style="display: none;"><td></td><td><button onclick="myFunction()">Calculate</button></td><td></td></tr> <tr id="rat" style="display: none;"><td>Turns Ratio :</td><td><input id="ratio" readonly=""/> </td><td></td></tr></tbody></table> </div></div> </div> <div class="wp-block-column"> <script data-rocketlazyloadscript="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" async=""></script>  <ins class="adsbygoogle" style="display:inline-block;width:300px;height:250px" data-ad-client="ca-pub-4567036280313464" data-ad-slot="4839624210"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> </div> <hr class="wp-block-separator has-text-color has-background has-very-dark-gray-background-color has-very-dark-gray-color"/> <h2><strong>What is turns ratio?</strong></h2> <p>Each coil of a transformer contains a certain number of turns of the conductor. <strong>Turns ratio</strong> is defined as the ratio of the number of turns of the conductor in the primary coil to the number of turns of the conductor in the secondary winding. Let N<sub>p </sub>be the number of turns of the conductor in the primary coil and N<sub>s</sub> is the number of turns of the conductor in the secondary coil then turns ratio of the transformer can be given by the following equation:</p> <div class="wp-block-image"><figure class="aligncenter is-resized"><picture class="wp-image-3109"> <source type="image/webp" data-lazy-srcset="https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1.png.webp 756w, https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1-300x126.png.webp 300w" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20189%2079'%3E%3C/svg%3E" data-lazy-sizes="(max-width: 189px) 100vw, 189px"/> <img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20189%2079'%3E%3C/svg%3E" alt="Transformer Turns ratio" width="189" height="79" data-lazy-srcset="https://web.archive.org/web/20210603060842/https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1.png 756w, https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1-300x126.png 300w" data-lazy-sizes="(max-width: 189px) 100vw, 189px" data-lazy-src="https://web.archive.org/web/20210603060842/https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1.png"/> </picture> <noscript><picture class="wp-image-3109"> <source type="image/webp" srcset="https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1.png.webp 756w, https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1-300x126.png.webp 300w" sizes="(max-width: 189px) 100vw, 189px"/> <img src="https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1.png" alt="Transformer Turns ratio" width="189" height="79" srcset="https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1.png 756w, https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/ratio-1024x317-1-300x126.png 300w" sizes="(max-width: 189px) 100vw, 189px"/> </picture> </noscript></figure></div> <h2><strong>Turns ratio in an ideal transformer</strong></h2> <p>An ideal transformer is assumed to have zero winding impedance, zero leakage flux, and zero losses. For an ideal transformer, consider an ideal transformer with Np number of turns in the primary and Ns number of turns in the secondary. Let Vp be the voltage applied to the primary at a frequency of ‘f’, the Vp be the voltage measured at the secondary. Let φbe the flux linking both coils.</p> <p>The voltage induced per turn of the primary is given by</p> <p><strong>V</strong><sub><strong>p </strong></sub><strong>/ N</strong><sub><strong>p</strong></sub><strong> = k. φ</strong><sub><strong>m</strong></sub><strong>.f</strong></p> <p>Where k is a constant and φ<sub>m</sub> is the maximum flux. From the above equation,</p> <p><strong>φ</strong><sub><strong>m</strong></sub><strong> = V</strong><sub><strong>p </strong></sub><strong>/ N</strong><sub><strong>p</strong></sub><strong>. k.f</strong></p> <p>Since same flux links the primary and the secondary,</p> <p>V<sub>s </sub>/ N<sub>s</sub> = k. φ<sub>m</sub>.f and φ<sub>m</sub> = V<sub>s </sub>/ N<sub>s</sub>. k.f</p> <p>Hence, V<sub>p </sub>/ N<sub>p</sub>. k.f = V<sub>s </sub>/ N<sub>s</sub>. k.f</p> <p><strong>Therefore, V</strong><sub><strong>p </strong></sub><strong>/ N</strong><sub><strong>p</strong></sub><strong>= V</strong><sub><strong>s </strong></sub><strong>/ N</strong><sub><strong>s</strong></sub><strong> and V</strong><sub><strong>p </strong></sub><strong>/ V</strong><sub><strong>s</strong></sub><strong> = N</strong><sub><strong>p</strong></sub><strong> / N</strong><sub><strong>s</strong></sub></p> <h2><strong>Relationship between Turns ratio and current</strong></h2> <p>For an ideal transformer, the input power is always equal to the output voltage.</p> <p>Hence, V<sub>p</sub>. I<sub>p</sub>. cosϕ = V<sub>s</sub>. I<sub>s</sub>. cosϕ </p> <p><strong>Therefore, V</strong><sub><strong>p </strong></sub><strong>/ V</strong><sub><strong>s</strong></sub><strong>= I</strong><sub><strong>s </strong></sub><strong>/ I</strong><sub><strong>p</strong></sub></p> <p>Where I<sub>p</sub> and I<sub>s </sub>primary and secondary current respectively.</p> <p>Hence for an ideal transformer, the output current varies as the inversely proportional to the voltage. In a step-up transformer, the primary voltage can be stepped up based on the turns ratio but the load current capability of the same at the stepped-up voltage will reduce as the inverse of the turns ratio.</p><div class="code-block code-block-1" style="margin: 8px auto; text-align: center; display: block; clear: both;">  <ins class="adsbygoogle" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-4567036280313464" data-ad-slot="3169262745"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> <figure class="wp-block-image"><picture class="wp-image-3030"> <source type="image/webp" data-lazy-srcset="https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-1024x438.jpg.webp 1024w, https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-300x128.jpg.webp 300w, https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-768x329.jpg.webp 768w, https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit.jpg.webp 1838w" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%201024%20438'%3E%3C/svg%3E" data-lazy-sizes="(max-width: 1024px) 100vw, 1024px"/> <img width="1024" height="438" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%201024%20438'%3E%3C/svg%3E" alt="" data-lazy-srcset="https://web.archive.org/web/20210603060842/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-1024x438.jpg 1024w, https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-300x128.jpg 300w, https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-768x329.jpg 768w, https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit.jpg 1838w" data-lazy-sizes="(max-width: 1024px) 100vw, 1024px" data-lazy-src="https://web.archive.org/web/20210603060842/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-1024x438.jpg"/> </picture> <noscript><picture class="wp-image-3030"> <source type="image/webp" srcset="https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-1024x438.jpg.webp 1024w, https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-300x128.jpg.webp 300w, https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-768x329.jpg.webp 768w, https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit.jpg.webp 1838w" sizes="(max-width: 1024px) 100vw, 1024px"/> <img width="1024" height="438" src="https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-1024x438.jpg" alt="" srcset="https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-1024x438.jpg 1024w, https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-300x128.jpg 300w, https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit-768x329.jpg 768w, https://web.archive.org/web/20210603060842im_/https://www.electricalclassroom.com/wp-content/uploads/2019/09/equivalent-circuit.jpg 1838w" sizes="(max-width: 1024px) 100vw, 1024px"/> </picture> </noscript></figure> <div class="code-block code-block-7" style="margin: 8px auto; text-align: center; display: block; clear: both;">   <ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-4567036280313464" data-ad-slot="6212986764"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div>  </div> <section id="comments" class="comments-area clr has-comments"> <h3 class="theme-heading comments-title"> <span class="text">This Post Has One Comment</span> </h3> <ol class="comment-list"> <li id="comment-276" class="comment-container"> <article class="comment even thread-even depth-1 comment-body"> <img alt="" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20150%20150'%3E%3C/svg%3E" data-lazy-srcset="https://web.archive.org/web/20210603060842/https://secure.gravatar.com/avatar/8ff48a3c539801f0ae4df218607c3623?s=300&d=mm&r=g 2x" class="avatar avatar-150 photo" height="150" width="150" data-lazy-src="https://web.archive.org/web/20210603060842/https://secure.gravatar.com/avatar/8ff48a3c539801f0ae4df218607c3623?s=150&d=mm&r=g"/><noscript><img alt="" src="https://web.archive.org/web/20210603060842im_/https://secure.gravatar.com/avatar/8ff48a3c539801f0ae4df218607c3623?s=150&d=mm&r=g" srcset="https://web.archive.org/web/20210603060842im_/https://secure.gravatar.com/avatar/8ff48a3c539801f0ae4df218607c3623?s=300&d=mm&r=g 2x" class="avatar avatar-150 photo" height="150" width="150"/></noscript> <div class="comment-content"> <div class="comment-author"> <span class="comment-link">Sergio </span> <span class="comment-meta commentmetadata"> <span class="comment-date">23 Mar 2020</span> <a rel="nofollow" class="comment-reply-link" href="#comment-276" data-commentid="276" data-postid="3039" data-belowelement="comment-276" data-respondelement="respond" data-replyto="Reply to Sergio" aria-label="Reply to Sergio">Reply</a> </span> </div> <div class="clr"></div> <div class="comment-entry"> <div class="comment-content"> <p>I need to build a 5000V 1.5 A transformer<br/> What is the size of core is available. I have access to a 3 D printer 12X12inches<br/> What size of metallic core is available, from what seller?<br/> I have access to lots of 12Ga transformer wire, both for primary and secondary. </p> <p>What do you recomend?</p> <p>Thanks in advance<br/> Sergio (480-299-9984)</p> </div> </div> </div> </article> </li> </ol> <div id="respond" class="comment-respond"> <h3 id="reply-title" class="comment-reply-title">Leave a Reply <small><a rel="nofollow" id="cancel-comment-reply-link" href="/web/20210603060842/https://www.electricalclassroom.com/transformer-ratio-calculator-online/#respond" style="display:none;">Cancel reply</a></small></h3><form action="https://web.archive.org/web/20210603060842/https://www.electricalclassroom.com/wp-comments-post.php" method="post" id="commentform" class="comment-form" novalidate=""><div class="comment-textarea"><label for="comment" class="screen-reader-text">Comment</label><textarea autocomplete="new-password" id="dd72222daf" name="dd72222daf" cols="39" rows="4" tabindex="0" class="textarea-comment" placeholder="Your comment here..."></textarea><textarea id="comment" aria-hidden="true" name="comment" autocomplete="new-password" style="padding:0 !important;clip:rect(1px, 1px, 1px, 1px) !important;position:absolute !important;white-space:nowrap !important;height:1px !important;width:1px !important;overflow:hidden !important;" tabindex="-1"></textarea><script data-noptimize="" type="text/javascript">document.getElementById("comment").setAttribute( "id", "a231c53ec9a29ba7e42c28b8c6ce85aa" );document.getElementById("dd72222daf").setAttribute( "id", "comment" );</script></div><div class="comment-form-author"><label for="author" class="screen-reader-text">Enter your name or username to comment</label><input type="text" name="author" id="author" value="" placeholder="Name (required)" size="22" tabindex="0" aria-required="true" class="input-name"/></div> <div class="comment-form-email"><label for="email" class="screen-reader-text">Enter your email address to comment</label><input type="text" name="email" id="email" value="" placeholder="Email (required)" size="22" tabindex="0" aria-required="true" class="input-email"/></div> <div class="comment-form-url"><label for="url" class="screen-reader-text">Enter your website URL (optional)</label><input type="text" name="url" id="url" value="" placeholder="Website" size="22" tabindex="0" class="input-website"/></div> <p class="form-submit"><input name="submit" type="submit" id="comment-submit" class="submit" value="Post Comment"/> <input type="hidden" name="comment_post_ID" value="3039" id="comment_post_ID"/> <input type="hidden" name="comment_parent" id="comment_parent" value="0"/> </p></form> </div> </section> </article> <div class="code-block code-block-3 ai-viewport-3" style="margin: 8px 0; 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