1460 lines
107 KiB
Text
1460 lines
107 KiB
Text
<!DOCTYPE html>
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<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
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<head>
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<h1 class="nist-page__title">What’s in a Name? The Tesla</h1>
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<div class="daterange"><time datetime="2023-07-10T12:00:00Z">July 10, 2023</time>
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<span>By: </span>
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<a href="/blogs/taking-measure/authors/sandy-ressler" hreflang="en">Sandy Ressler</a>
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<img loading="lazy" src="/sites/default/files/styles/960_x_960_limit/public/images/2023/07/06/Whats_ina_Name_HeaderDesign_Tesla_July2023_070623_0.png?itok=s_IDI_I9" width="960" height="350" alt="Header graphic featuring photo of Nikola Tesla, an MRI machine, and electricity" typeof="foaf:Image">
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B. Hayes/NIST, Shutterstock
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<p>Do you enjoy flipping on the light switch or plugging in that favorite electrical device? Well, you can thank Nikola Tesla — <a href="https://www.pbs.org/newshour/science/5-things-you-didnt-know-about-nikola-tesla">born 167 years ago today</a> — for that amazing invention. </p><p>You may think of Thomas Edison as the main pioneer in electricity. But Nikola Tesla brought us alternating current (AC) electricity, which is the type of electricity that is widely used in our homes and buildings today. As the name implies, alternating current reverses direction at regular intervals, and it turns out that it’s much better for moving electric power over long distances. </p> <figure class=" align-right nist-image" role="group">
|
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<div>
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||
|
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<img alt="Drawing of Nikola Tesla with his chin propped on his hand. " height="320" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2023/07/03/Tesla%20vkilikov%20shutterstock_1604648221.jpg?itok=F5UVEIQ4" typeof="foaf:Image" width="480">
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<figcaption class="nist-image__caption">Nikola Tesla<div class="nist-image__credit">
|
||
<span class="nist-image__credit-label">Credit:</span>
|
||
|
||
vkilikov/Shutterstock
|
||
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</div></figcaption>
|
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</figure>
|
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|
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<p>This is different from direct current (DC) electricity, which is commonly used in batteries. While Edison did not invent DC, he did have patents on this type of electricity. Edison was a big proponent of DC power before Tesla demonstrated <a href="https://www.aps.org/publications/apsnews/200305/history.cfm">AC power’s advantages</a> in 1893. This led to a feud between the two pioneers, known as the “<a href="https://www.energy.gov/articles/war-currents-ac-vs-dc-power">War of the Currents</a>.”</p><p>Like many early inventors and scientists, Tesla has a unit of measure named after him. </p><p>The “tesla” is the unit for magnetic flux density. Think of magnetic flux density as a measure of magnetic strength. Imagine you are holding a sugar cube in your hand; it’s fairly light and not very dense. Now, imagine the cube turns into lead. It’s now heavy and quite dense. The tesla is a measure of that density, but for the strength of a magnetic field instead of the mass of an object.</p><p>That tesla is not just an abstract physics term; it’s actually used every day. </p><p>One particularly important area is when it comes to MRI machines that are widely used in medicine. When you get an MRI, you’re placed in a <a href="https://www.nibib.nih.gov/science-education/science-topics/magnetic-resonance-imaging-mri">large magnet</a>. The tesla is a measure of the strength of that magnetic field that surrounds you in the machine. </p> <figure class=" align-center nist-image" role="group">
|
||
<div>
|
||
|
||
<img alt="View through the top end of an MRI machine as a dark-haired patient lies inside. " height="6336" loading="lazy" src="/sites/default/files/images/2023/07/03/MRI%20Orion%20Production%20shutterstock_1951533514.jpg" typeof="foaf:Image" width="9504">
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</div>
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<figcaption class="nist-image__caption">The tesla is a measure of strength of the magnetic field that surrounds a patient when they’re in an MRI machine.<div class="nist-image__credit">
|
||
<span class="nist-image__credit-label">Credit:</span>
|
||
|
||
Orion Production/Shutterstock
|
||
|
||
</div></figcaption>
|
||
</figure>
|
||
|
||
<p>A typical MRI machine has 1.5 to 3.0 teslas in strength. Experimental MRIs even go up to <a href="https://www.google.com/url?q=https://www.nature.com/articles/d41586-018-07182-7&sa=D&source=docs&ust=1686248829889484&usg=AOvVaw0uHB40zxBHkDmTX4OIEPeQ">10.5 teslas</a>. The different types of MRI machines use varying amounts of teslas depending on the quality of images you need.</p><p>Besides the tesla, there’s a similar measurement for a related quantity known as magnetic flux, which measures the total magnetic field going through an object, as opposed to just its density. That’s called a “<a href="https://www.britannica.com/science/weber">weber</a>.” No, you can’t make these names up! The weber is named after <a href="https://www.britannica.com/biography/Wilhelm-Eduard-Weber">Wilhelm Eduard Weber</a>. Here’s <a href="https://www.facebook.com/NIST/videos/stephan-schlamminger-on-wilhelm-eduard-webers-birthday/247181214048335/">how you say his name</a> in case you were wondering. </p><p>But today we’re here to remember Tesla’s contributions on his birthday, so we will save <a href="https://www.nist.gov/blogs/taking-measure/whats-name-magnetic-weber">Mr. Weber</a> for another day. </p><div class="nist-callout"><h2>More Taking Measure Posts About Historical Figures in Science </h2><ul><li><a href="https://www.nist.gov/blogs/taking-measure/whats-name-magnetic-weber">What’s in a Name? The Magnetic Weber </a></li><li><a href="/blogs/taking-measure/under-pressure-blaise-pascal-barometer-and-bike-tires" data-entity-type="node" data-entity-uuid="b0b3dc51-c313-410a-9a2c-e0f82f10b72a" data-entity-substitution="canonical" title="Under Pressure: Blaise Pascal, the Barometer and Bike Tires">Under Pressure: Blaise Pascal, the Barometer and Bike Tires</a></li><li><a href="/blogs/taking-measure/henry-moseley-patriotic-scientist-who-changed-periodic-table-and-then-went-war" data-entity-type="node" data-entity-uuid="5694d25f-180c-4dd2-aa17-1677189d918f" data-entity-substitution="canonical" title="Henry Moseley: A Patriotic Scientist Who Changed the Periodic Table — and Then Went Off to War ">Henry Moseley: A Patriotic Scientist Who Changed the Periodic Table — and Then Went Off to War</a></li><li><a href="/blogs/taking-measure/ada-lovelace-worlds-first-computer-programmer-who-predicted-artificial" data-entity-type="node" data-entity-uuid="b98e7057-96d8-4a08-8fb7-9b98782f8e8f" data-entity-substitution="canonical" title="Ada Lovelace: The World’s First Computer Programmer Who Predicted Artificial Intelligence">Ada Lovelace: The World’s First Computer Programmer Who Predicted Artificial Intelligence</a></li><li><a href="/blogs/taking-measure/alan-turings-everlasting-contributions-computing-ai-and-cryptography" data-entity-type="node" data-entity-uuid="08e6e750-1f7f-40a0-a497-7e0d6d27ac42" data-entity-substitution="canonical" title="Alan Turing’s Everlasting Contributions to Computing, AI and Cryptography">Alan Turing’s Everlasting Contributions to Computing, AI and Cryptography</a></li></ul></div><p><span lang="EN"></span></p><p><span lang="EN"></span></p>
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<div class="nist-tags">
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<a href="/blogs/taking-measure/categories/248321">Bioscience</a>,
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>About the author</h2>
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about="/blogs/taking-measure/authors/sandy-ressler" class="nist-teaser"
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<div class="entity-reference"> <a href="/blogs/taking-measure/authors/sandy-ressler" hreflang="en"><img loading="lazy" src="/sites/default/files/styles/thumbnail/public/images/2016/12/16/screenshot_144.jpg?itok=e9TUhNvM" width="82" height="100" typeof="foaf:Image" />
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<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/authors/sandy-ressler"><span>Sandy Ressler</span>
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</a></h3>
|
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</header>
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<div class="nist-teaser__content">
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<div class="text-with-summary"><p>Sandy Ressler has been at NIST for nearly 40 years. (Yes, he’s old.) Following a short few years at Bell Labs, during which it was broken up (not due to Sandy’s work), Sandy has been doing computer graphics of various sorts at NIST. He is involved with 3D standards for the web and a variety of virtual reality technologies. He’s the co-author of the now classic <em>Life with UNIX</em> and the virtually unknown <em>Art of Electronic Publishing.</em> He holds an M.F.A. in visual arts (computer graphics), which continues to confuse management. In his off time, he loves to chase his grandkids.</p></div>
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>Related posts</h2>
|
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|
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<div><div class="js-view-dom-id-c735e1106ae0df926bac3552ea23247389de9e45a025cfc889e2e2a20d2fd96d">
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about="/blogs/taking-measure/high-flying-science-how-and-why-we-sent-refrigerator-halfway-space" class="nist-teaser"
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<div class="entity-reference"> <a href="/blogs/taking-measure/high-flying-science-how-and-why-we-sent-refrigerator-halfway-space" hreflang="en"><img loading="lazy" src="/sites/default/files/styles/thumbnail/public/images/2025/01/23/ephraim_gau_tes_balloon_in_air_012125.JPG?itok=vkGGerAo" width="75" height="100" alt="A rectangular box coated with reflective foil hangs from cables over a parking lot." typeof="foaf:Image" />
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|
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<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/high-flying-science-how-and-why-we-sent-refrigerator-halfway-space"><span>High-Flying Science: How and Why We Sent a Refrigerator Halfway to Space</span>
|
||
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|
||
<div class="nist-teaser__date">
|
||
<div class="daterange"><time datetime="2025-02-12T12:00:00Z">February 12, 2025</time>
|
||
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|
||
|
||
</div>
|
||
|
||
</header>
|
||
<div class="nist-teaser__content">
|
||
<div class="text-with-summary"> NIST-developed tools can study the remnants of the Big Bang and more, and now researchers are working to launch these tools high above the Earth’s atmosphere —
|
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<div class="entity-reference"> <a href="/blogs/taking-measure/5-concepts-can-help-you-understand-quantum-mechanics-and-technology-without" hreflang="en"><img loading="lazy" src="/sites/default/files/styles/thumbnail/public/images/2023/10/16/tara_fortier_working_in_lab_october_2023.jpg?itok=RkM9HePP" width="100" height="67" alt="A researcher wearing safety glasses reaches into a box of circuitry and other equipment, which emits a green glow. " typeof="foaf:Image" />
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||
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<header>
|
||
<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/5-concepts-can-help-you-understand-quantum-mechanics-and-technology-without"><span>5 Concepts Can Help You Understand Quantum Mechanics and Technology — Without Math!</span>
|
||
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|
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<div class="nist-teaser__date">
|
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<div class="daterange"><time datetime="2025-02-05T12:00:00Z">February 5, 2025</time>
|
||
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|
||
</div>
|
||
|
||
</header>
|
||
<div class="nist-teaser__content">
|
||
<div class="text-with-summary"> Quantum is everywhere, and you can understand the basic quirks of life at the quantum level … no math required.
|
||
|
||
</div>
|
||
|
||
</div>
|
||
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|
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|
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<article
|
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about="/blogs/taking-measure/robots-and-ai-are-working-together-bring-you-better-medicines-shampoo-and-more" class="nist-teaser"
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<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/robots-and-ai-are-working-together-bring-you-better-medicines-shampoo-and-more"><span>Robots and AI Are Working Together to Bring You Better Medicines, Shampoo and More</span>
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<div class="daterange"><time datetime="2025-01-15T12:00:00Z">January 15, 2025</time>
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<div class="nist-teaser__content">
|
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<div class="text-with-summary"> Products you use every day are carefully formulated in a lab. Experts at NIST are now working to revolutionize how those products are made.
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>Comments</h2>
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<article data-comment-user-id="0" id="comment-155901" class="nist-comment js-comment">
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|
||
<p class="submitted">
|
||
<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Bob brown</span></span>
|
||
on
|
||
<span class="nist-comment__date">August 29, 2024 11:46 PM</span>
|
||
<mark class="hidden nist-comment__new" data-comment-timestamp="1725015152"></mark>
|
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|
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<div class="nist-comment__permalink"><a href="#comment-155901">Permalink</a></div>
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|
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<div class="nist-comment__content">
|
||
<div class="text-long"><p>I’ve been in electronics for over 40 years and the term tesla didn’t appear until after elon musk bought the rights to the name. Why is that. Tesla discovered a c power after edison energised the light bulb using dc electric. Most foreign countries use a form of dc power to light there cities.</p>
|
||
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|
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<article data-comment-user-id="0" id="comment-156616" class="nist-comment js-comment">
|
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|
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<footer class="nist-comment__info">
|
||
<p class="submitted">
|
||
<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Rob Smith</span></span>
|
||
on
|
||
<span class="nist-comment__date">October 23, 2024 1:08 PM</span>
|
||
<mark class="hidden nist-comment__new" data-comment-timestamp="1729725467"></mark>
|
||
<span class="nist-comment__parent">| Replied to <a href="/comment/155901#comment-155901" class="permalink" rel="bookmark" hreflang="en">I’ve been in electronics for…</a></span>
|
||
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|
||
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<div class="nist-comment__permalink"><a href="#comment-156616">Permalink</a></div>
|
||
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||
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|
||
|
||
<div class="nist-comment__content">
|
||
<div class="text-long"><p>The tesla was adopted in 1960 by the General Conference on Weights and Measures as the standard unit of magnetic flux density. One tesla equals 10,000 gauss. The military-surplus magnetron magnet I used in a 7th-grade science-fair experiment in 1967 had a field strength of 0.09 tesla, or 900 gauss.<br />
|
||
Magnetic field strength in power transformers, magnetic-field sensors, loudspeakers, microwave-oven magnetrons, etc. is specified in teslas. Earth's magnetic-field strength is in units of microteslas (µT).<br />
|
||
Tesla, Inc. bought the Tesla *trademark,* not the name which is in the public domain, and may use the Tesla *trademark* only in the automotive, energy storage, and solar-energy industries.</p>
|
||
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|
||
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||
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<article data-comment-user-id="0" id="comment-157871" class="nist-comment js-comment">
|
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<footer class="nist-comment__info">
|
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<p class="submitted">
|
||
<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Elijah duncan</span></span>
|
||
on
|
||
<span class="nist-comment__date">January 23, 2025 10:28 PM</span>
|
||
<mark class="hidden nist-comment__new" data-comment-timestamp="1738086601"></mark>
|
||
</p>
|
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<div class="nist-comment__permalink"><a href="#comment-157871">Permalink</a></div>
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||
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||
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||
<div class="nist-comment__content">
|
||
<div class="text-long"><p>he is the coolest and boring man.</p>
|
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