【正文】 但是，我們把電感器看作是通過其電感量L表現(xiàn)為時域形式而通過其阻抗表現(xiàn)為頻域形式，電容在時域里為電容量C而在頻域里為，阻抗是某種程度上的頻域變量而非時域變量。Section 5 Exercise 3 相電壓與相電流之比等于電路的阻抗，符號為字母Z，阻抗是一個具有量綱為歐姆的復數(shù)量。而這種方法被稱為疊加法。Section 4 Exercise 3 如果一個電路有兩個或多個獨立源，求出具體變量值（電流或電壓）的一種方法是使用節(jié)點分析法或網(wǎng)孔分析法。只有當需要強調(diào)元件性質(zhì)的時候才使用更長的形式稱呼它。我們可以很容易地買到或制造電阻器，但很快我們發(fā)現(xiàn)這種物理元件只有當電流、電壓或者功率處于特定范圍時其電壓——電流之比才是恒定的，并且這個比值也取決于溫度以及其它環(huán)境因素。（介賓從句）The fact that everything around us is matter is known to 。（賓語從句）This is how a puter 。（定語從句）The instrument that we often use is very good in 。（定語從句）The instrument that we often use is very good in 。（賓語從句）The fact is that radio waves travel as fast as light 。（狀語從句）It is possible that we use a puter to solve these plicated 。（動名詞作表語）When an electric current flow through a wire it meets some ，它會遇到某種阻力。（動名詞作主語）By changing the resistance，we can change the ，我們就能改變電流。 plants fueled by uranium account for a continually increasing share of the load, but their construction is slow and uncertain because of the difficulty of raising capital to meet the sharply rising cost of construction, constantly increasing safety requirements which cause redesign, public opposition to the operation of the plants, and delays in through a circuit, the current will lose part of it ，要損耗掉一部分能量。 stations have ratings between 200 MW and 1500 MW so as to attain the high efficiency and economy of a large ，以實現(xiàn)大站的高效經(jīng)濟（運行）。 plants can cause low dissolved oxygen levels in the water, a problem that is harmful to riverbank ——（這是）一個對岸邊生存環(huán)境有害的問題。 kind of loads, especially those consume energy calculated by standard coals more over 10 thousands of tons per year, has a name of high energy consuming ，尤其是那些年耗能萬噸標準煤以上的負荷，被稱為高耗能負荷。, loads are devices those consume electric energy or electric power consumed by customers mainly in distribution ，負荷是主要在配電網(wǎng)中消耗電能的設(shè)備或者由用戶消耗的功率。一次系統(tǒng)也給經(jīng)過單相三線電路為居民用電和商業(yè)用戶提供120V/240V二次電壓的配電變壓器供電。電容的測量單位是法拉。Electrical energy can be stored in two metal plates separated by an insulating a device is called capacitor or ability to store electrical energy is is measured in farads 電能可儲存在由一絕緣介質(zhì)隔開的兩塊金屬極板內(nèi)?！癆 per unit of B” 表示 “單位B上的A” 或者“A/B”。 exists between the conductors and is the charge on the conductors per unit of potential difference between ，等于導體上的電荷（電量）與導體間的電勢差之比。, the capability of lines of the same length varies at a rate somewhat greater than the square of the ，長度相同的線路的容量，以比電壓的平方略大的比率變化。2)The instruments present include some digital ones which are relative to instruments present include some digital ones relative to 。3)The testing of a crossfield generator will be described in this section with chief reference to the tests that are normally taken on every machine before it leaves the makers ，它主要涉及每臺電機在離開制造廠前應(yīng)進行的試驗。1)It has been mentioned above that the electrons in a metalare able to move freely through the metal, that their motion constitutes an electric current in the metal and that they play an important part in conduction of ：金屬中電子能自由地通過金屬，電子的移動在金屬中形成了電流，電子在熱傳導中起著重要的作用。2)As illustrated in , there is a feedback element in the closedloop in , there is a feedback element in the closedloop ，這個閉環(huán)系統(tǒng)中有一個反饋元件。2)What does a fuse do? It protects a function of a fuse is to protect a 。3)The transistor, which is working with correctly polarities, can work as an transistor working with correctly polarities can work as an ，作用就像放大器。1)The power supply, which is shown in blockdiagram in , is a singlephase switchmode power supply shown in blockdiagram in is a singlephase switchmode 。4)Changing