When electricity goes back and forth, as it does in the sockets in your wall, some things in a machine fight that flow. Impedance is a number that says how strongly a piece of equipment fights that back-and-forth current.

When electricity goes back and forth當電流來回流動時, as it does in the sockets in your wall就像你家牆上插座裡的電流一樣, some things in a machine fight that flow機器裡有些東西會抵抗這種流動. Impedanceimpedance is a number that says是一個數字,說明 how strongly a piece of equipment fights that back-and-forth current一個設備抵抗這種來回電流的力道有多強

People measure it in ohms, the same unit as resistance, which is why the two words get mixed up. Though actually they are not the same: resistance is the simple fight that turns energy into heat; impedance is the whole fight, including the extra push-back you get from parts like coils and capacitors.

People measure it in ohms人們用歐姆來測量它, the same unit as resistance跟resistance(電阻)用的是同一個單位, which is why the two words get mixed up這也是為什麼這兩個字常被搞混. Though actually不過 they are not the same它們其實不一樣: resistance is the simple fight that turns energy into heatresistance是把能量變成熱的那種單純的抵抗; impedance is the whole fightimpedance是整體的抵抗, including the extra push-back you get from parts like coils and capacitors還包括線圈、電容這類零件帶來的額外反作用力

You will see the word on headphones and speakers — a high impedance means the player has to work harder to make them loud.

You will see the word on headphones and speakers你會在耳機和喇叭上看到這個字 — a high impedance meansimpedance高表示 the player has to work harder to make them loud播放器要更用力才能讓它們發出足夠的音量

It is a science and engineering word, not a word for ordinary talk. An English mathematician and physicist, Oliver Heaviside, gave this electrical meaning the name in 1886.

It這 is a science and engineering word是科學和工程用語, not a word for ordinary talk不是日常講話會用的字. An English mathematician and physicist一位英國數學家兼物理學家, Oliver HeavisideOliver Heaviside, gave this electrical meaning the name in 1886在1886年給了這個電學上的意思這個名字