跟讀練習: OHM's Law in 3 minutes (Beginner friendly) - 通過影片學習英語口語
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Named after Greg Ohm, Ohm's law is arguably one of the most important and fundamental equations to understanding electricity.
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In a nutshell, Ohm's law showcases us the relationship between resistance, current and voltage in electricity.
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The power of Ohm's law comes in the ability to shuffle around the equation to calculate for either voltage,
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current or resistance in this lesson we will learn how to use these equations for our calculations
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and when to use which equation
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and how to mash up different equations together for our calculations now in case you don't know what current voltage
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and resistance is you can learn these terms by comparing water to electricity in
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that case water pressure can be compared to electrical voltage the
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volume of water flowing can be compared to electric current and the restriction of water flow can be compared to electrical resistance.
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Now going back to the equations, if the equations that I showed you earlier felt like too much to remember,
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you can simply refer to an Ohm's law triangle to derive the appropriate equation for your calculation.
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To use a triangle, firstly cover up the value that you want to calculate for.
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Now look at the other two values that are not covered up.
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If these two variables are side by side, that means they will be multiplied to get the value that you desire.
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If they are on top of each other like this, they will be divided in that appropriate order like so.
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Let's do a quick example here with the circuit.
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Let's say we know the value of the resistor but we don't know how much current is flowing through the circuit.
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We can use Ohm's law to derive the current as this.
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When an electronics device follows these rules and equations, it is called an ohmic device and when it doesn't follow these rules and equations, it's called a non -ohmic device.
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Examples of non -ohmic devices are semiconductors such as transistors and diodes.
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Now we have already seen how we can use Ohm's law and shuffle it around to either calculate for resistance,
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current or voltage, but you can also substitute other equations into Ohm's law making it even more flexible for your needs.
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For example, we can substitute the V or I variables here in Ohm's law and get equations such as these.
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This makes calculations for your circuits and projects easier and more flexible.
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Due to us being able to substitute other equations into Ohm's law, we can use something like an Ohm's law pie chart, as you can see here, to do more advanced calculations.
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Again, these are not new equations per se, but rather equations that are formed by shifting and merging multiple different equations to make them easier for our calculations.
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This is thanks to the beauty of algebra.
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And that's it for this video.
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Thanks for watching.
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為什麼這個影片是練習口語的好材料？
對於想通過看影片學英語的人來說，這個講解歐姆定律的影片再合適不過了。它語速適中，用詞簡潔，既有專業術語又有生活化的比喻（比如用水流類比電流），非常適合英語口語練習。影片裡的表達自然流暢，沒有複雜的長難句，能幫助學習者掌握實用的說明性語言，對雅思口語練習也很有幫助——畢竟雅思口語考試中經常需要清晰地解釋概念。
拆解自然表達，學習地道口語
我們來看看影片裡的幾個句子，為什麼它們聽起來很自然：
- “In a nutshell, Ohm's law showcases us the relationship...” 這裡用“In a nutshell”（簡而言之）引出核心內容，口語中常用這種短語來簡化表達，讓聽眾更容易跟上。
- “if the equations... felt like too much to remember, you can simply refer to...” 用“felt like too much to remember”表達“覺得難記”，非常口語化，比生硬的“difficult to remember”更自然。
- “Examples of non-ohmic devices are semiconductors such as transistors and diodes.” 用“such as”舉例，符合口語中舉例的習慣，避免了過於正式的“for example”。
這些表達既準確又接地氣，是提高英語發音和流利度的好素材。
簡單有效的“影子跟讀法”練習流程
想要用好這個影片練習口語，可以試試shadowspeak（影子跟讀法）：
- 先完整看一遍影片，理解內容，標記出不熟悉的詞彙（如“ohmic device”“semiconductors”）。
- 逐句播放，每句暫停後立刻跟讀，模仿發音、語調和節奏。重點練習“shuffle around”“mash up”等短語的連讀。
- 用手機錄製自己的跟讀音訊，對比原影片，找出發音和語速的差異，反覆修正。
- 嘗試脫稿複述影片內容，用自己的話解釋歐姆定律，鍛鍊語言組織能力。
每天堅持10分鐘，既能學知識又能練口語，一舉兩得！
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。