江蘇春晨電纜有限公司生產(chǎn)YFFB扁電纜YFFB行車扁電纜拖鏈扁電纜，

其實(shí)嚴(yán)格來(lái)講，這個(gè)“插頭”叫開(kāi)關(guān)電源適配器，目的是將電網(wǎng)傳來(lái)的交流電轉(zhuǎn)換為直流電傳輸進(jìn)電子設(shè)備中。筆記本電腦的電源適配器更大，冬天暖手更方便~

In fact, this "plug" is called the switch power adapter, the purpose is to convert the alternating current from the power grid to the direct current transmission into the electronic equipment. The power adapter of the laptop is bigger, and the warm hand is more convenient in winter.

那為啥要把交流電換成直流電呢?讓我們從頭講起。

Why do you want to change the AC to DC? Let's talk about it from the beginning.

電是一種自然現(xiàn)象。電荷靜止或移動(dòng)會(huì)產(chǎn)生很多有意思物理現(xiàn)象，比如雷雨天氣中會(huì)看到的閃電、冬天脫毛衣的時(shí)候噼里啪啦的火花。后來(lái)，科學(xué)家們從各種電效應(yīng)中發(fā)現(xiàn)規(guī)律，于是發(fā)明出了電池、發(fā)電機(jī)、電動(dòng)機(jī)。

Electricity is a natural phenomenon. The charge or mobile will have a lot of interesting physical phenomena, such as thunderstorms will see the lightning in the winter, when the crackling sparks off a sweater. Later, scientists discovered laws from various electrical effects and invented the batteries, generators, and motors.

先用直流電，還是先用交流電?YFFB扁電纜YFFB行車扁電纜拖鏈扁電纜

First use direct current, or the first use of alternating current?

220伏/50赫茲交流電是我國(guó)的供電標(biāo)準(zhǔn)，所以很多人都以為家用電器用的都是交流電。至于直流電，大概除了那句廣告中會(huì)念叨的“直流變頻空調(diào)”，想不到其他的了吧。

220 volt /50 Hertz alternating current is the power supply standard of our country, so many people think that the household appliances are all alternating current. As for the direct current, it may not be possible except for the "DC frequency conversion air conditioning" that will be said in the advertisement.

其實(shí)，直流電應(yīng)用很廣泛，你肯定見(jiàn)過(guò)，也用過(guò)。比如：

In fact, the use of direct current is very wide, you must have seen, also used. For example:

定義

Definition

直流電，是指方向不隨時(shí)間發(fā)生變化的電流。YFFB扁電纜YFFB行車扁電纜拖鏈扁電纜

Direct current refers to the current that does not change with time.

交流電，是指大小和方向都發(fā)生周期性變化的電流。

Alternating current (AC) refers to a current that changes periodically in size and direction.

從示波器觀測(cè)，一個(gè)是直的，一個(gè)彎的……

From the oscilloscope, one is straight, a curved one...

反正都是電，感覺(jué)差別不大?

It's all electricity anyway, and it doesn't feel very different?

No~No~No~

No~No~No~

讓我們翻開(kāi)歷史，講點(diǎn)八卦!

Let's turn over the history and tell the gossip!

直流電，是電力革命急先鋒。在早期的電磁學(xué)實(shí)驗(yàn)中，人們總是想方設(shè)法把產(chǎn)生的電能轉(zhuǎn)變?yōu)橹绷麟姟?/p>

Direct current is the pioneer of the electric power revolution. In the early electromagnetics experiment, people always tried to transform the generated electric energy into DC.

1879年，托馬斯˙愛(ài)迪生制成只碳絲白熾燈，吸引了大量投資。此后，小愛(ài)同學(xué)一路順風(fēng)順?biāo)?882年的一個(gè)夜晚，110伏的直流電輸送到紐約曼哈頓整個(gè)街區(qū)……大家終于可以扔掉煤油燈啦~

In 1879, Thomas Edison, made the first carbon filament incandescent lamp, attracted a lot of investment. Since then, Edward I wish you a happy voyage. smooth, one night in 1882, DC electricity to New York Manhattan the whole block of 110 volts...... You can finally throw away the kerosene lamp.

然而，直流輸電的弊端也隨著使用范圍的擴(kuò)大而逐漸顯現(xiàn)：電壓不變的情況下，供電距離的增加和用戶的增長(zhǎng)加劇了線路損耗。小型直流中心電站供電區(qū)域于2公里不到的方圓內(nèi)。

However, the drawbacks of HVDC are also increasing with the expansion of the scope of application. Under the condition of constant voltage, the increase of power supply and the growth of users aggravate the line loss. The power supply area of a small DC central power station is limited to the square of less than 2 kilometers.

因?yàn)閾p耗量=電流電阻，所以減小電流就能減少損耗。

Because of the loss of current = - resistance, so reducing the current can reduce the loss.

在傳輸功率保持不變的情況下，電流和電壓成反比，所以，提高電壓就能減小電流，減小損耗。

When the transmission power remains constant, the current is inversely proportional to the voltage, so increasing the voltage can reduce the current and reduce the loss.

當(dāng)時(shí)高壓直流技術(shù)尚不成熟，直流電變壓比較復(fù)雜。這時(shí)候，塞爾維亞小青年尼古拉˙特斯拉背著書(shū)包，跨越大洋奔向偶像愛(ài)迪生。他有一個(gè)不太成熟的小建議——交流輸電。交流電機(jī)比直流電機(jī)結(jié)構(gòu)更簡(jiǎn)單，容易變壓，可以簡(jiǎn)單、經(jīng)濟(jì)、可靠地解決提高輸電電壓的問(wèn)題。

At that time, the high voltage DC technology was not yet mature, and the DC voltage was more complex. At this time, the Serbia youth Nicola Tesla back schoolbag, across the ocean to the idol Edison. He has an immature little suggestion - AC transmission. AC motor is simpler than DC motor and easy to change pressure. It can solve the problem of increasing transmission voltage simply, economically and reliably.

可是，這個(gè)建議被霸道總裁拒絕了。有人說(shuō)是因?yàn)樾?ài)同學(xué)沒(méi)上過(guò)幾天學(xué)，不懂高數(shù)，交流電對(duì)他來(lái)說(shuō)有點(diǎn)抽象。為了阻撓交流電發(fā)展，愛(ài)迪生除了當(dāng)眾做交流電電死動(dòng)物實(shí)驗(yàn)、發(fā)動(dòng)媒體報(bào)道交流電事故，還促成電椅的發(fā)明——用交流電執(zhí)行死刑。

However, the proposal was rejected by the overlord. Some people say that is because the students love not in a few days, do not understand the high number of alternating current for him a