Power Resistor | Electronics Forum (Circuits, Projects and Microcontrollers)

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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">Power Resistor</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/jb33.327169/" class="username u-concealed" dir="auto" data-user-id="327169" data-xf-init="member-tooltip">jb33</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/power-resistor.166947/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-11-25T07:41:33-0800" data-time="1732549293" data-date-string="Nov 25, 2024" data-time-string="7:41 AM" title="Nov 25, 2024 at 7:41 AM">Nov 25, 2024</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content"> <div class="p-body-pageContent"> <div class="block block--messages" data-xf-init="" data-type="post" data-href="/inline-mod/" data-search-target="*"> <span class="u-anchorTarget" id="posts"></span> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container lbContainer" data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-166947" data-lb-universal="0"> <div class="block-body js-replyNewMessageContainer"> <article class="message message--post js-post js-inlineModContainer " data-author="jb33" data-content="post-1457839" id="js-post-1457839" > <span class="u-anchorTarget" id="post-1457839"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/jb33.327169/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="327169" data-xf-init="member-tooltip" style="background-color: #cccc99; color: #77773c"> <span class="avatar-u327169-m" role="img" aria-label="jb33">J</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/jb33.327169/" class="username " dir="auto" data-user-id="327169" data-xf-init="member-tooltip">jb33</a></h4> <h5 class="userTitle message-userTitle" dir="auto">New Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/power-resistor.166947/post-1457839" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-11-25T07:41:33-0800" data-time="1732549293" data-date-string="Nov 25, 2024" data-time-string="7:41 AM" title="Nov 25, 2024 at 7:41 AM">Nov 25, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/power-resistor.166947/post-1457839" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1457839/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/power-resistor.166947/post-1457839" rel="nofollow"> #1 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1457839" data-lb-caption-desc="jb33 · Nov 25, 2024 at 7:41 AM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Hello All,<br /> Throughout my entire electronic education, I've always found a little 'm' to represent milli, and a capital 'M' to represent Mega. Now, the attached photos are of a power resistor from Micron. Based off of the datasheet, this is most certainly a 10 Watt resistor, and, I have even double-checked the measurements given in the table. My problem is that is says, for a 10W resistor, the ohm ranges are from 1ohm to 1kohm. This would rule out that the little 'm' has any possibility of representing Mega, so it must represent milli. However, even with the 5% tolerance, a 22milli ohm resistor is still far less than 1 ohm. So, what exactly am I missing here, and why does a resistor with such a low ohm rating need an enormously large ceramic casing?</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> <section class="message-attachments"> <h4 class="block-textHeader">Attachments</h4> <ul class="attachmentList"> <li class="file file--linked"> <a class="u-anchorTarget" id="attachment-147854"></a> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. 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itemscope itemid="https://www.electro-tech-online.com/threads/power-resistor.166947/" /> <span class="u-anchorTarget" id="post-1457844"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.electro-tech-online.com/members/nigel-goodwin.10131/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/nigel-goodwin.10131/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/nigel-goodwin.10131/" class="avatar avatar--m" data-user-id="10131" data-xf-init="member-tooltip"> <img src="/data/avatars/m/10/10131.jpg?1378874952" alt="Nigel Goodwin" class="avatar-u10131-m" width="96" height="96" loading="lazy" itemprop="image" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/nigel-goodwin.10131/" class="username " dir="auto" data-user-id="10131" data-xf-init="member-tooltip"><span class="username--style5 username--moderator username--admin" itemprop="name">Nigel Goodwin</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Super Moderator</h5> <div class="userBanner userBanner userBanner--gray message-userBanner" itemprop="jobTitle"><span class="userBanner-before"></span><strong>Most Helpful Member</strong><span class="userBanner-after"></span></div> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/power-resistor.166947/post-1457844" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-25T08:21:19-0800" data-time="1732551679" data-date-string="Nov 25, 2024" data-time-string="8:21 AM" title="Nov 25, 2024 at 8:21 AM" itemprop="datePublished">Nov 25, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/power-resistor.166947/post-1457844" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1457844/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/power-resistor.166947/post-1457844" rel="nofollow"> #2 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1457844" data-lb-caption-desc="Nigel Goodwin · Nov 25, 2024 at 8:21 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">It's clearly marked 20milli ohms, what's the problem? - why do you think they have never made a 20milli ohm version?.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <aside class="message-signature"> <div class="bbWrapper">PIC programmer software, and PIC Tutorials at:<br /> <a href="http://www.winpicprog.co.uk" target="_blank" class="link link--external" rel="noopener">http://www.winpicprog.co.uk</a></div> </aside> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="jb33" data-content="post-1457848" id="js-post-1457848" itemscope itemtype="https://schema.org/Comment" itemid="https://www.electro-tech-online.com/posts/1457848/"> <meta 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data-xf-init="member-tooltip"><span itemprop="name">jb33</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">New Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/power-resistor.166947/post-1457848" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-25T09:13:26-0800" data-time="1732554806" data-date-string="Nov 25, 2024" data-time-string="9:13 AM" title="Nov 25, 2024 at 9:13 AM" itemprop="datePublished">Nov 25, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/power-resistor.166947/post-1457848" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1457848/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/power-resistor.166947/post-1457848" rel="nofollow"> #3 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1457848" data-lb-caption-desc="jb33 · Nov 25, 2024 at 9:13 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">I've never seen a resistor rated this low in such a hefty package, that's all.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="reactionsBar 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class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/power-resistor.166947/post-1457850" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-25T11:57:46-0800" data-time="1732564666" data-date-string="Nov 25, 2024" data-time-string="11:57 AM" title="Nov 25, 2024 at 11:57 AM" itemprop="datePublished">Nov 25, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/power-resistor.166947/post-1457850" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1457850/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/power-resistor.166947/post-1457850" rel="nofollow"> #4 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1457850" data-lb-caption-desc="ZipZapOuch · Nov 25, 2024 at 11:57 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 10131" data-quote="Nigel Goodwin" data-source="post: 1457844" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1457844" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1457844">Nigel Goodwin said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> It's clearly marked 20milli ohms, what's the problem? - why do you think they have never made a 20milli ohm version?. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Although the datasheet for that resistor doesn't list the 10W version going that low in resistance, the label on the part is clear enough to confirm otherwise. It is possible that the manufacturer didn't update the datasheet when they extended the range of available resistances.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <aside class="message-signature"> <div class="bbWrapper">"The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command.”<br /> ― George Orwell, 1984 (published June 8, 1949)</div> </aside> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="Nigel Goodwin" data-content="post-1457852" id="js-post-1457852" itemscope itemtype="https://schema.org/Comment" itemid="https://www.electro-tech-online.com/posts/1457852/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/power-resistor.166947/" /> <span class="u-anchorTarget" id="post-1457852"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.electro-tech-online.com/members/nigel-goodwin.10131/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/nigel-goodwin.10131/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/nigel-goodwin.10131/" class="avatar avatar--m" data-user-id="10131" data-xf-init="member-tooltip"> <img src="/data/avatars/m/10/10131.jpg?1378874952" alt="Nigel Goodwin" class="avatar-u10131-m" width="96" height="96" loading="lazy" itemprop="image" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/nigel-goodwin.10131/" class="username " dir="auto" data-user-id="10131" data-xf-init="member-tooltip"><span class="username--style5 username--moderator username--admin" itemprop="name">Nigel Goodwin</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Super Moderator</h5> <div class="userBanner userBanner userBanner--gray message-userBanner" itemprop="jobTitle"><span class="userBanner-before"></span><strong>Most Helpful Member</strong><span class="userBanner-after"></span></div> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/power-resistor.166947/post-1457852" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-25T12:03:57-0800" data-time="1732565037" data-date-string="Nov 25, 2024" data-time-string="12:03 PM" title="Nov 25, 2024 at 12:03 PM" itemprop="datePublished">Nov 25, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/power-resistor.166947/post-1457852" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1457852/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/power-resistor.166947/post-1457852" rel="nofollow"> #5 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1457852" data-lb-caption-desc="Nigel Goodwin · Nov 25, 2024 at 12:03 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 322126" data-quote="ZipZapOuch" data-source="post: 1457850" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1457850" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1457850">ZipZapOuch said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Although the datasheet for that resistor doesn't list the 10W version going that low in resistance, the label on the part is clear enough to confirm otherwise. It is possible that the manufacturer didn't update the datasheet when they extended the range of available resistances. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote><br /> It's possibly just the wrong datasheet?, there may be more than one?, or it could be a specific special value made for a client - so no datasheet.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <aside class="message-signature"> <div class="bbWrapper">PIC programmer software, and PIC Tutorials at:<br /> <a href="http://www.winpicprog.co.uk" target="_blank" class="link link--external" rel="noopener">http://www.winpicprog.co.uk</a></div> </aside> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="1" /> <meta itemprop="interactionType" 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Are you sure you want to submit this form?", attach: "Attach files", rich_text_box: "Rich text box", close: "Close", link_copied_to_clipboard: "Link copied to clipboard.", text_copied_to_clipboard: "Text copied to clipboard.", loading: "Loading…", you_have_exceeded_maximum_number_of_selectable_items: "You have exceeded the maximum number of selectable items.", processing: "Processing", 'processing...': "Processing…", showing_x_of_y_items: "Showing {count} of {total} items", showing_all_items: "Showing all items", no_items_to_display: "No items to display", number_button_up: "Increase", number_button_down: "Decrease", push_enable_notification_title: "Push notifications enabled successfully at Electronics Forum (Circuits, Projects and Microcontrollers)", push_enable_notification_body: "Thank you for enabling push notifications!", pull_down_to_refresh: "Pull down to refresh", release_to_refresh: "Release to refresh", refreshing: "Refreshing…" , "svStandardLib_time.day": "{count} day", "svStandardLib_time.days": "{count} days", "svStandardLib_time.hour": "{count} hour", "svStandardLib_time.hours": "{count} hours", "svStandardLib_time.minute": "{count} minutes", "svStandardLib_time.minutes": "{count} minutes", "svStandardLib_time.month": "{count} month", "svStandardLib_time.months": "{count} months", "svStandardLib_time.second": "{count} second", "svStandardLib_time.seconds": "{count} seconds", "svStandardLib_time.week": "time.week", "svStandardLib_time.weeks": "{count} weeks", "svStandardLib_time.year": "{count} year", "svStandardLib_time.years": "{count} years" }); </script> <form style="display:none" hidden="hidden"> <input type="text" name="_xfClientLoadTime" value="" id="_xfClientLoadTime" title="_xfClientLoadTime" tabindex="-1" /> </form>    <div id='div-gpt-eto_wallpaper'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eto_wallpaper'); }); </script> </div>  <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "WebPage", "url": "https://www.electro-tech-online.com/threads/power-resistor.166947/", "mainEntity": { "@type": "DiscussionForumPosting", "@id": "https://www.electro-tech-online.com/threads/power-resistor.166947/", "headline": "Power Resistor", "datePublished": "2024-11-25T15:41:33+00:00", "url": "https://www.electro-tech-online.com/threads/power-resistor.166947/", "articleSection": "General Electronics Chat", "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/jb33.327169/", "name": "jb33", "url": "https://www.electro-tech-online.com/members/jb33.327169/" }, "interactionStatistic": [ { "@type": "InteractionCounter", "interactionType": "https://schema.org/ViewAction", "userInteractionCount": 841 }, { "@type": "InteractionCounter", "interactionType": "https://schema.org/CommentAction", "userInteractionCount": 4 }, { "@type": "InteractionCounter", "interactionType": "https://schema.org/LikeAction", "userInteractionCount": 0 } ], "image": "https://www.electro-tech-online.com/attachments/power-resistor-jpg.147854/", "articleBody": "Hello All,\nThroughout my entire electronic education, I've always found a little 'm' to represent milli, and a capital 'M' to represent Mega. Now, the attached photos are of a power resistor from Micron. Based off of the datasheet, this is most certainly a 10 Watt resistor, and, I have even double-checked the measurements given in the table. My problem is that is says, for a 10W resistor, the ohm ranges are from 1ohm to 1kohm. This would rule out that the little 'm' has any possibility of representing Mega, so it must represent milli. However, even with the 5% tolerance, a 22milli ohm resistor is still far less than 1 ohm. So, what exactly am I missing here, and why does a resistor with such a low ohm rating need an enormously large ceramic casing?" }, "publisher": { "@type": "Organization", "name": "Electronics Forum (Circuits, Projects and Microcontrollers)", "description": "An electronics forum to talk all about circuits and projects.", "url": "https://www.electro-tech-online.com" } } </script>  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MMC9PJ9" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>   <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KLX5R59" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>  <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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