喜樂美語
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    A cathode is one of the two ends of a thing that carries electric current — a battery, a tube, a diode. In many school books it is the minus end, marked (−), and they say current leaves the equipment there.

    A cathodecathode（陰極）， is one of the two ends of a thing that carries electric current指的是通電裝置的兩端之一—— a battery, a tube, a diode像電池、真空管、二極體這類東西。In many school books在很多學校教材裡， it is the minus end, marked (−)它是負極，標記成(−)， and they say current leaves the equipment there而且說電流是從那一端離開裝置的。

    Though actually this is one of the messiest science words we have, and that tidy picture is tidier than real talk.

    Though actually this is one of the messiest science words we have不過其實，這是科學用語裡數一數二混亂的一個字， and that tidy picture is tidier than real talk剛剛那個整齊的說法，其實比實際的用法還要整齊。

    In an old radio valve, or in many electronic parts, the cathode is the negative side. In a battery that is giving you power, chemists name the cathode by what the chemistry is doing at that end — and that end is the plus end. So “cathode = minus” is true in some machines and false in others.

    In an old radio valve, or in many electronic parts在老式的真空管，或很多電子零件裡， the cathode is the negative sidecathode是負的那一端。In a battery that is giving you power在正在供電的電池裡， chemists name the cathode by what the chemistry is doing at that end化學家是根據那一端正在發生的化學反應來命名cathode—— and that end is the plus end而那一端其實是正極。So所以， "cathode = minus"「cathode等於負極」這句話 is true in some machines在有些裝置裡是對的， and false in others在有些裝置裡卻是錯的。

    The name was made in 1834 by William Whewell for Michael Faraday, from Greek kata- “down” and hodos “way, road”: a “way down”. Faraday pictured current as a journey downward onto that end. The other end is the , the “way up”.

    The name was made in 1834 by William Whewell for Michael Faraday這個名字是1834年William Whewell為Michael Faraday創造的， from Greek kata- "down"來自希臘文kata-，意思是「向下」， and hodos "way, road"和hodos，意思是「路」： a "way down"合起來就是「往下走的路」。Faraday pictured current as a journey downward onto that endFaraday把電流想像成一段往那一端往下走的旅程。The other end is the anode另一端則是anode， the "way up"也就是「往上走的路」。

    例句逐字對照、搭配詞、易混淆字

    這一義的完整解析還沒打開。訂閱後可以看到例句怎麼拆、常跟哪些字一起出現， 以及容易跟它搞混的字。

    看看訂閱內容

組成古希臘文 kata-（往下）+ hodos（路、走的路），合成 káthodos「往下的路」。1834 年 Whewell 為 Faraday 造了這個英文詞。拆開看就是 cath- + -ode。

同家族的字

  • anodethe other end; built as a ‘way up’ beside this ‘way down’
  • electrodeany of these ends; it keeps the same old ‘way’ piece

原始詞典資料4 筆記錄

以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。

cathodenoun/ˈkæθ.oʊd/

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    businesselectrical-engineeringelectricityAn electrode, of a cell or other electrically polarized device, through which a positive current of electricity flows outwards (and thus, electrons flow inwards). It can have either a negative or a positive voltage with respect to anode of the same polarized device (depending on whether the device is a load or a source, respectively).

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    The electrode at which chemical reduction of cations takes place, usually resulting in the deposition of metal onto the electrode.

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    businesselectrical-engineeringelectricityThe electrode from which electrons are emitted into a vacuum tube or gas-filled tube.

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    businesselectrical-engineeringelectricityThat electrode of a semiconductor device which is connected to the n-type material of a p-n junction.

資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。