{"id":65008,"date":"2026-07-02T04:13:09","date_gmt":"2026-07-01T19:13:09","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=65008"},"modified":"2026-07-02T04:13:09","modified_gmt":"2026-07-01T19:13:09","slug":"see-the-invisible-the-mysterious-phase-shift-hiding-in-coils","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=65008&lang=en","title":{"rendered":"See the Invisible: The Mysterious Phase Shift Hiding in Coils"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\"><strong>I&#8217;m Ken Kuwako, the Science Trainer. Every day is an experiment.<\/strong><\/span><\/p>\n<h3>Did You Know That Current and Voltage Can Actually Fall Out of Step?<\/h3>\n<p>Have you ever imagined that the electricity flowing from a wall outlet might have voltage and current that aren&#8217;t perfectly synchronized? We use electricity every day without giving it much thought, but what powers our homes is alternating current (AC), where voltage and current constantly rise and fall like waves. Depending on the electrical component, those waves can line up perfectly\u2014or drift apart in time.<\/p>\n<p>In this experiment, we used an EasySense sensor to make this normally invisible behavior visible.<\/p>\n<p>We measured the phase difference between voltage and current when AC voltage was applied to a coil. The recording lasted 500 ms with a sampling rate of 1000, giving us a highly detailed waveform. (Looking back, a 100 ms recording might actually have made the wave patterns easier to see.) Before we dive in, take a look at the video below.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u30b3\u30a4\u30eb\u306b\u6d41\u308c\u308b\u96fb\u6d41\u3068\u96fb\u5727\u306e\u4f4d\u76f8\u5dee\u3010\u4ea4\u6d41\u56de\u8def\u3011\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/Ek7PEVZe2EQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>In the graph, the red line represents voltage, while the blue line represents current.<\/p>\n<h3>First, the Basics: With a Resistor, They Move Perfectly Together<\/h3>\n<p>Let&#8217;s begin by looking at what happens when AC flows through a resistor.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-37552 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_4752.jpg\" alt=\"\" width=\"600\" height=\"448\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_4752.jpg 1226w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_4752-300x224.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_4752-1024x765.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_4752-768x574.jpg 768w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Notice how the red voltage wave and the blue current wave overlap almost perfectly, like identical twins. Every peak and every valley occur at exactly the same moment.<\/p>\n<p>That&#8217;s because a resistor has a very simple job: it merely limits the flow of electricity. As soon as the voltage rises, the current rises with it. Their relationship is direct and immediate, with no delay between them.<\/p>\n<h3>Everything Changes with a Coil: Voltage Leads, Current Follows<\/h3>\n<p>Now let&#8217;s replace the resistor with a coil while applying the same AC voltage.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-37554 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/43e025055848fdb83e874f387614e214.jpg\" alt=\"\" width=\"655\" height=\"473\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/43e025055848fdb83e874f387614e214.jpg 916w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/43e025055848fdb83e874f387614e214-300x217.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/43e025055848fdb83e874f387614e214-768x555.jpg 768w\" sizes=\"auto, (max-width: 655px) 100vw, 655px\" \/><\/p>\n<p>This graph tells a completely different story. The voltage reaches its peak first, and the current arrives a little later. It&#8217;s almost like a game of tag, where the voltage takes off first and the current chases after it.<\/p>\n<p>The delay isn&#8217;t random\u2014it measures exactly 90 degrees of phase difference. In other words, the current reaches its maximum one-quarter of a cycle after the voltage does.<\/p>\n<h3>Why Does the Current Lag Behind in a Coil?<\/h3>\n<p>The answer lies in a unique property of coils.<\/p>\n<p>Whenever current flows through a coil, it creates a magnetic field around it. With alternating current, that magnetic field is constantly changing as the current changes.<\/p>\n<p>A changing magnetic field causes the coil to produce a voltage that opposes the change in current. This phenomenon is called <b>self-induction<\/b>.<\/p>\n<p>You can think of it as the coil applying its own brakes. Even when the applied voltage is saying, &#8220;Come on, current\u2014speed up!&#8221;, the coil generates a back electromotive force (back EMF) that resists that change. As a result, the current cannot respond instantly and lags behind.<\/p>\n<p>That slight hesitation is exactly what appears on the graph as a 90-degree phase difference.<\/p>\n<h3>This Hidden Property Powers Many Everyday Devices<\/h3>\n<p>The behavior of coils isn&#8217;t just something you see in physics labs. It&#8217;s essential to countless devices we use every day.<\/p>\n<p>Fluorescent lamp ballasts, transformers, electric motors, speakers, and even wireless smartphone chargers all rely on coils.<\/p>\n<p>Engineers either take advantage of the phase difference between voltage and current or work to minimize the energy losses it can create. Either way, understanding this timing difference is a key part of making modern electrical devices work efficiently.<\/p>\n<p>Electricity is usually invisible, but by plotting it with sensors, we can watch voltage and current perform an elegant dance\u2014sometimes moving perfectly in sync, and sometimes intentionally stepping out of rhythm.<\/p>\n<h3>Contact &amp; More Science Fun<\/h3>\n<p>Bring the wonder of science closer to home! Here you&#8217;ll find easy-to-understand science experiments you can try yourself, along with practical tips and explanations. Feel free to explore more articles!<\/p>\n<p>\u2022 The Science Notebook has been published as a book. Learn more <a href=\"https:\/\/amzn.to\/42PMCEL\">here<\/a>.<br \/>\n\u2022 Want to know more about Ken Kuwako? Click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">here<\/a>.<br \/>\n\u2022 For writing, lectures, science workshops, TV supervision, appearances, and other collaborations, click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">here<\/a>.<br \/>\n<span class=\"s2\">\u2022 Follow the latest article updates on <a href=\"https:\/\/x.com\/kuwako\">X<\/a>!<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.youtube.com\/user\/kkuwako\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35048\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/3d9640dad7bc5538e76f92da1966ee19.jpg\" alt=\"\" width=\"30\" height=\"21\" \/><\/a><a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Science Notebook Channel<\/a> features exciting science experiment videos!<\/p>\n<h3>\uff17\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n<p style=\"text-align: center;\">\u590f\u3067\u30d7\u30b7\u30e5\u30c3\u3068\u723d\u3084\u304b\u5b9f\u9a13\uff01<\/p>\r\n<p><img class=\"alignnone  wp-image-64964 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-06-30-4.31.58.jpeg\" alt=\"\" width=\"250\" height=\"310\" \/><\/p>\r\n<p style=\"text-align: center;\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=206\">\u5c0f\u578b\u3067\u6301\u3061\u5e30\u308c\u308b\u3088\uff01\u30da\u30c3\u30c8\u30dc\u30c8\u30eb\u30ed\u30b1\u30c3\u30c8\u3092\u4f5c\u308d\u3046\uff01<\/a><\/p>\r\n<h3 style=\"text-align: left;\"><span style=\"font-size: medium;\"><b><strong>\u30c6\u30ec\u30d3\u756a\u7d44\u76e3\u4fee\u30fb\u30a4\u30d9\u30f3\u30c8\u7b49\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/span><\/h3>\r\n<ul>\r\n<li>\r\n<p>\u6642\u901f\uff12\uff10\uff10\uff4b\uff4d\u3067\u8d70\u308b\u30e9\u30f3\u30dc\u30eb\u30ae\u30fc\u30cb\u304c\u3001\u9577\u3055\uff11\uff12\uff4d\u306e\u30c6\u30fc\u30d6\u30eb\u30af\u30ed\u30b9\u3092\u4e00\u77ac\u3067\u5f15\u304d\u629c\u304f\u2014\u2014\u305d\u3093\u306a\u5e38\u8b58\u7834\u308a\u306e\u5b9f\u9a13\u304c\u3001\u3075\u305f\u305f\u3073\u30c6\u30ec\u30d3\u306e\u4e16\u754c\u3067\u5927\u304d\u306a\u8a71\u984c\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3057\u304b\u3082\u4eca\u56de\u306f\u300c\u8996\u8074\u8005\u304c\u9078\u3076\u30ef\u30af\u30ef\u30af\u5b9f\u9a13\u30e9\u30f3\u30ad\u30f3\u30b0\u300d\u3067\u3001\u306a\u3093\u3068\u5802\u3005\u306e\u7b2c\uff11\u4f4d\u3092\u7372\u5f97\u3057\u305f\u306e\u3067\u3059\u3002<a href=\"https:\/\/tver.jp\/episodes\/epxk5ysq54?p=781\">Tver\u3067\u307e\u3060\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044<\/a>\u3002<\/p>\r\n<p><img class=\"alignnone  wp-image-65002 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-01-4.42.07.jpeg\" sizes=\"(max-width: 546px) 100vw, 546px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-01-4.42.07.jpeg 1052w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-01-4.42.07-300x162.jpeg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-01-4.42.07-1024x553.jpeg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-01-4.42.07-768x415.jpeg 768w\" alt=\"\" width=\"546\" height=\"295\" \/><\/p>\r\n<\/li>\r\n<li>7\u670818\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=60018\">\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u300c\u30ca\u30ea\u30ab\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\u300d\u306e\u8b1b\u5e2b\u3092\u3057\u307e\u3059<\/a>\u3002\u304a\u4f1a\u3044\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\r\n<li>12\u670826\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=64825\">\u30ca\u30ea\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\uff08\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\uff09\u958b\u50ac<\/a><\/li>\r\n<\/ul>\r\n<h3><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/h3>\r\n<ul>\r\n<li>\uff17\u670816\u65e5\u767a\u58f2\u3000\u300e<a href=\"https:\/\/amzn.to\/4vmkUfb\">\u9ad8\u6821\u5165\u8a66 \u5206\u89e3\u554f\u984c\u96c6 \u7406\u79d1<\/a>\u300f\uff08\u5b66\u7814\uff09\u2026\u96e3\u3057\u3044\u554f\u984c\u3082\u5c0f\u3055\u306a\u554f\u984c\u306b\u5206\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u554f\u984c\u3092\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u3093\u306a\u5206\u89e3\u306e\u6280\u8853\u304c\u8eab\u306b\u3064\u304f\u3088\u3046\u306b\u6df1\u304f\u95a2\u308f\u308a\u3092\u6301\u3063\u3066\u4f5c\u308a\u307e\u3057\u305f\u3002<br \/><img class=\"alignnone  wp-image-64694 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-06-20-18.25.27.jpeg\" alt=\"\" width=\"197\" height=\"275\" \/><\/li>\r\n<li>\u300e\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u300f\uff08\u8b1b\u8ac7\u793e\uff09\u2026\u4e00\u822c\u5411\u3051\u306b\u65e5\u5e38\u306e\u7269\u7406\u306b\u3064\u3044\u3066\u516c\u5f0f\u3092\u5143\u306b\u7d10\u89e3\u304d\u307e\u3057\u305f\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=1827\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u3067\u306f\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<strong>\u203b\u5897\u5237\u304c\u304b\u304b\u308a\uff16\u5237\u3068\u306a\u308a\u307e\u3057\u305f\uff082026\/02\/01\uff09<br \/><img class=\"alignnone wp-image-10940 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg\" sizes=\"(max-width: 220px) 100vw, 220px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0.jpg 311w\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2014-07-05 0.43.51\" width=\"220\" height=\"192\" \/><br \/><\/strong><\/li>\r\n<li>\u300e\u304d\u3081\u308b!\u5171\u901a\u30c6\u30b9\u30c8 \u7269\u7406\u57fa\u790e \u6539\u8a02\u7248\u300f\uff08\u5b66\u7814\uff09\u2026\u3000\u9ad8\u6821\u7269\u7406\u306e\u53c2\u8003\u66f8\u3067\u3059\u3002\u30a4\u30e9\u30b9\u30c8\u3092\u591a\u304f\u3057\u3066\u30a4\u30e1\u30fc\u30b8\u304c\u6301\u3066\u308b\u3088\u3046\u306b\u63cf\u304d\u307e\u3057\u305f\u3002\u6388\u696d\u306b\u3064\u3044\u3066\u3044\u3051\u306a\u3044\u3001\u7269\u7406\u304c\u82e6\u624b\u3001\u305d\u3093\u306a\u751f\u5f92\u306b\u304a\u3059\u3059\u3081\u3067\u3059\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=45322\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u306f\u3053\u3061\u3089\u3002<br \/><img class=\"alignnone wp-image-45718 aligncenter\" 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src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-02-6.18.26-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-02-6.18.26-150x150.jpeg 150w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-02-6.18.26-300x300.jpeg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-02-6.18.26.jpeg 624w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=65026\">\u80c3\u306f\u81ea\u5206\u3092\u6eb6\u304b\u3055\u306a\u3044\u306e\u304b\uff1f170\u5e74\u524d\u306e\u66b4\u767a\u4e8b\u6545\u304c\u6559\u3048\u3066\u304f\u308c\u305f\u3053\u3068\uff08\u52d5\u753b\u300c\u4eba\u4f53\u306e\u6d88\u5316\u306e\u5999\u300d\uff09<\/a><time datetime=\"2026-07-02T05:07:00+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67082\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=65018&#038;lang=fi\" aria-label=\"N\u00e4e n\u00e4kym\u00e4t\u00f6n s\u00e4hk\u00f6! Kelan salaper\u00e4inen vaihe-ero\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_1790-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=65018&#038;lang=fi\">N\u00e4e n\u00e4kym\u00e4t\u00f6n s\u00e4hk\u00f6! Kelan salaper\u00e4inen vaihe-ero<\/a><time datetime=\"2026-07-02T04:16:26+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67082\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=65016&#038;lang=es\" aria-label=\"\u00a1Mira lo invisible! El misterioso desfase que crea una bobina\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_1790-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=65016&#038;lang=es\">\u00a1Mira lo invisible! El misterioso desfase que crea una bobina<\/a><time datetime=\"2026-07-02T04:15:55+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67082\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=65014&#038;lang=hi\" aria-label=\"\u0905\u0926\u0943\u0936\u094d\u092f \u092c\u093f\u091c\u0932\u0940 \u0915\u094b \u0926\u0947\u0916\u093f\u090f! \u0915\u0949\u0907\u0932 \u092e\u0947\u0902 \u091b\u093f\u092a\u093e \u0930\u0939\u0938\u094d\u092f\u092e\u092f\u0940 \u092b\u0947\u091c\u093c \u0936\u093f\u092b\u094d\u091f\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_1790-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=65014&#038;lang=hi\">\u0905\u0926\u0943\u0936\u094d\u092f \u092c\u093f\u091c\u0932\u0940 \u0915\u094b \u0926\u0947\u0916\u093f\u090f! \u0915\u0949\u0907\u0932 \u092e\u0947\u0902 \u091b\u093f\u092a\u093e \u0930\u0939\u0938\u094d\u092f\u092e\u092f\u0940 \u092b\u0947\u091c\u093c \u0936\u093f\u092b\u094d\u091f<\/a><time datetime=\"2026-07-02T04:14:52+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67082\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=65012&#038;lang=zh\" aria-label=\"\u770b\u898b\u770b\u4e0d\u898b\u7684\u96fb\u6d41\uff01\u7dda\u5708\u5f15\u767c\u7684\u795e\u79d8\u76f8\u4f4d\u5dee\u4e4b\u8b0e\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_1790-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=65012&#038;lang=zh\">\u770b\u898b\u770b\u4e0d\u898b\u7684\u96fb\u6d41\uff01\u7dda\u5708\u5f15\u767c\u7684\u795e\u79d8\u76f8\u4f4d\u5dee\u4e4b\u8b0e<\/a><time datetime=\"2026-07-02T04:14:25+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67082\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=65010&#038;lang=ko\" aria-label=\"\ubcf4\uc774\uc9c0 \uc54a\ub294 \uc804\uae30\ub97c \ub208\uc73c\ub85c \ubcf4\ub2e4! \ucf54\uc77c\uc774 \ub9cc\ub4dc\ub294 \uc2e0\ube44\ud55c \uc704\uc0c1\ucc28 \uc774\uc57c\uae30\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_1790-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=65010&#038;lang=ko\">\ubcf4\uc774\uc9c0 \uc54a\ub294 \uc804\uae30\ub97c \ub208\uc73c\ub85c \ubcf4\ub2e4! \ucf54\uc77c\uc774 \ub9cc\ub4dc\ub294 \uc2e0\ube44\ud55c \uc704\uc0c1\ucc28 \uc774\uc57c\uae30<\/a><time datetime=\"2026-07-02T04:13:37+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67082\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=65008&#038;lang=en\" aria-label=\"See the Invisible: The Mysterious Phase Shift Hiding in Coils\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_1790-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=65008&#038;lang=en\">See the Invisible: The Mysterious Phase Shift Hiding in Coils<\/a><time datetime=\"2026-07-02T04:13:09+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67082\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=37532\" aria-label=\"\u898b\u3048\u306a\u3044\u96fb\u6c17\u3092\u898b\u3066\u307f\u3088\u3046\uff01\u30b3\u30a4\u30eb\u304c\u8d77\u3053\u3059\u4e0d\u601d\u8b70\u306a\u4f4d\u76f8\u5dee\uff08\u4ea4\u6d41\u56de\u8def\uff09\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_1790-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=37532\">\u898b\u3048\u306a\u3044\u96fb\u6c17\u3092\u898b\u3066\u307f\u3088\u3046\uff01\u30b3\u30a4\u30eb\u304c\u8d77\u3053\u3059\u4e0d\u601d\u8b70\u306a\u4f4d\u76f8\u5dee\uff08\u4ea4\u6d41\u56de\u8def\uff09<\/a><time datetime=\"2026-07-02T04:10:33+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67082\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=64801\" aria-label=\"\u3010\u79d1\u5b66\u76e3\u4fee\u3011\u30e9\u30f3\u30dc\u30eb\u30ae\u30fc\u30cb\u3067\u30c6\u30fc\u30d6\u30eb\u30af\u30ed\u30b9\u5f15\u304d\uff01\u8996\u8074\u8005\u4eba\u6c17No.1\u306b\u9078\u3070\u308c\u307e\u3057\u305f\uff08\u30cd\u30a4\u30c1\u30e3\u30fc\u30c6\u30a3\u30fc\u30c1\u30e3\u30fc\uff09\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-01-4.42.07-150x150.jpeg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=64801\">\u3010\u79d1\u5b66\u76e3\u4fee\u3011\u30e9\u30f3\u30dc\u30eb\u30ae\u30fc\u30cb\u3067\u30c6\u30fc\u30d6\u30eb\u30af\u30ed\u30b9\u5f15\u304d\uff01\u8996\u8074\u8005\u4eba\u6c17No.1\u306b\u9078\u3070\u308c\u307e\u3057\u305f\uff08\u30cd\u30a4\u30c1\u30e3\u30fc\u30c6\u30a3\u30fc\u30c1\u30e3\u30fc\uff09<\/a><time datetime=\"2026-07-01T04:32:37+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e747\u67081\u65e5<\/time><\/li>\n<\/ul>\r\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>I&#8217;m Ken Kuwako, the Science Trainer. Every day is an experiment. Did You Know That Current and Voltage C [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":37533,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","sns_share_botton_hide":"","vkExUnit_sns_title":"","vkexunit_cta_each_option":"","_lightning_design_setting":{"layout":"default"},"footnotes":"","jetpack_post_was_ever_published":false},"categories":[781],"tags":[],"class_list":["post-65008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack_featured_media_url":"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/IMG_1790.jpg","jetpack-related-posts":[{"id":61573,"url":"https:\/\/phys-edu.net\/wp\/?p=61573&lang=en","url_meta":{"origin":65008,"position":0},"title":"Visualizing Electricity\u2019s Chase! 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Every day is\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/82044aec2c7a705ed49a63a73f3039a4.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/82044aec2c7a705ed49a63a73f3039a4.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/82044aec2c7a705ed49a63a73f3039a4.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/82044aec2c7a705ed49a63a73f3039a4.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":63461,"url":"https:\/\/phys-edu.net\/wp\/?p=63461&lang=en","url_meta":{"origin":65008,"position":1},"title":"Just by \u201cHolding\u201d the Connection?! 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