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1、1.目前,煤仍然是凝汽式電廠最長用的能源。At present coal is the most common food of a steam power plant.2.為防止人畜觸電,高壓電一般采用架空線輸送。High voltage current is usually carried by overhead wire system so as to prevent living things being electrocuted.3.這座由電子計算機控制的核電站將向全市供電。This nuclear power plant which is computer-controlled wi
2、ll serve the entire city.4.電學(xué)與電子學(xué)實際上是唯一難以分開的,二者相互滲透,相互聯(lián)系。Electricity and electronics are really indivisible, each forming part of the other.5.元件技術(shù)中起主要作用的是半導(dǎo)體元件。The major contributors in component technology have been in the sosemiconductor components.6.電壓,電流和電阻這三個因素是相互關(guān)聯(lián)的。The factors, voltage, curre
3、nt and resistance , are related to each other .7.電動機與發(fā)電機就是以磁和電這二者之間的關(guān)系為基礎(chǔ)的Based upon the relationship between magnetism and electricity are motors and generators8,隨著電氣工程學(xué)的發(fā)展,電力能被輸送到非常遙遠(yuǎn)的地方去。With the development of electrical engineering , power can be transmitted over long distance.9每時每刻,能量都在由一種形式變成
4、另一種形式。Every moment of every day, energy is being transformed from one form into another.10.只要知道電壓和電流,就能測定電阻。The resistance can be determined provided that the voltage and current are known.11.已經(jīng)證明,能量是不可能消滅的,只能轉(zhuǎn)換成其他形式。It has been proved that energy cant be destroyed , it can only be changed into othe
5、r forms.12??梢姶判圆牧蠌V泛用于現(xiàn)在電子設(shè)備中。It can be seen that magnetic materials are used in a wide range of modern electronic equipment.13.在熱電廠燃燒的化學(xué)能并未全部轉(zhuǎn)變成熱能。In a thermal power plant , all the chemical energy of the fuel is not converted into heat .14.電流過導(dǎo)線就像水流過管子一樣。The flowing of electricity through a wire is
6、 not unlike that of water through a pipe.15.沒有檢查好儀表,切勿開始做實驗。Never start to do the experiment before you have checked the meter16同性電荷相斥,異性電荷相吸Like charges repel each other while opposite charges attract。17發(fā)展經(jīng)濟必須注意環(huán)境保護Attention must be paid to environmental protection in developing economy18nothing in
7、 the world moves faster than light19自動化能幫助我們提高產(chǎn)量30%Automation will help us to raise the output of production by thirty percent20只要知道電壓、電流、就能測定電阻The resistance can be determined provided that the voltage and current are known1.(A temperature transducer ) is a device that a voltage or a current propor
8、tional to the actual temperature.2.when the speed of the rotor is zero, the ship of induction machine is (1.0).3.copper losses are(resistive) losses in the primary and secondary windings of the transformer core.4.residential and commercial customers are supplied by the secondary distribution feeders
9、 of (220/380v).5.the frequency of a power system is determined mainly by (active power generation and consumption).1.many electrical signals derived from physical systems are obtained from devices called (transducers).2.the air-blast circuit breaker makes use the arc-quenching properties of (dry and
10、 clean compressed air).3.in a computer, most processing take place in a computer called the (CPU).1.the difference between a potential transformer and a power transformer is that potential transformer is designed to handle only a very small current.電壓互感器與電力變壓器的區(qū)別在于電壓互感器被設(shè)計為只能處理很小的電流。1.可是盡管電壓表與電流表之間有
11、這些類似之處,但還有若干重要的差異。However, in spite of all this similarity between a voltmeter and an ammeter there are also important difference.2.在電壓相同的情況下,導(dǎo)線的電阻越大,流過的電流就越小。The greater the resistance of a wire, the less electric current will pass through it under the same pressure.3.利用發(fā)電機,可將機械能再轉(zhuǎn)變成電能。The mechanic
12、al energy can be changed back into electrical energy by means of a generator.4、如果實用變壓器,低電壓的電力就能抓轉(zhuǎn)換成高電壓的電力Using a transformer ,power at low voltage can be transformed into power at high voltage1. It is conventional to take the current flow as the movement of (positive charges)2. Electric current is t
13、he time rate of charge, measured in (amperes).3. The energy required to move a unit charge through an element is (voltage).4. The plus (+) and minus (-) signs in an electric circuit diagram are used to define (voltage polarity).5. According to the passive sign convention, if the power has a plus sig
14、n, power is (absorbed) by the element.1. An independent voltage source is a (two-terminal element), which maintains a specified voltage between its terminals.2. Resistors are (passive) elements.3. An ideal dependent source is an (active) element in which the source quantity is controlled by another
15、voltage or current.4. There are (four) possible types of dependent sources.5. For a voltage source, its terminal voltage is known but its (current) must be determined by the external circuit connecting with it1. The voltage produced by a thermocouple pair is (an analog) signal.2. ON-OFF information
16、can be represented by (a digital) signal.3. A device that can convert an analog signal to the corresponding digital form is called (A/D)for short.4. The thermocouple pair converts temperature difference to a(voltage).5. A D/A is a device that can convert a digital signal to the equivalent (analog fo
17、rm).1. The process of quantizing the continuous values into a binary scale is called (analog-to-digital conversion).2. (A temperature transducer)is a device that produces a voltage or a current proportional to the actual temperature.3. The precision and the speed of an ADC are essentially (incompati
18、ble).4. The precision of ADC is determined by (the number of binary bits).5. In Fig.2-4the amplifier performs (two) functions.1. The thumb is in the direction of (the relative motion of conductor)in Flemings right-hand rule.2. In induction motors the speed of the rotating rotor (never reaches)the sp
19、eed of the rotating magnetic field.3. When the speed of the rotor is zero, the slip of induction machine is (1.0).4. Form-wound coils are widely used for (large AC) motors.4-4(P84)1. A transformer is a device that can converter one ac voltage to another ac voltage through the action of (a magnetic f
20、ield).2. The primary winding is connected to (the power source).3. The core construction consisting of a three-legged laminated core with the windings wrapped around the centre leg is called (shell form).4. The transformer that takes the distribution voltage and steps it down to the final voltage at
21、 which the power is actually used is called a (distribution transformer).5. Copper losses are (resistive) losses in the primary and secondary windings of the transformer core.5-1(P89)1. A computer works automatically according to (a series of stored instructions)2. A keyboard or a mouse is (an input
22、) device.3. The computer network for a university is usually described as (a local area network).4. A computer that requests data from a server is called as (client).5. A hard disk is referred to as (a storage) device.5-4(P108)1. (A support module) can be used in conjunction with the main software p
23、rogram to provide an auxiliary set instructions.2. A computers microprocessor only understands (machine language).3. Delphi belongs to (high-level programming language).4. An operating system is considered as (system software).5. (The file management system) allocates and manages secondary storage s
24、pace and translates file requests from their name-based form into specific I/O requests.6-1(P118)1. The first complete power system was built in (1882), it was (a DC) power system.2. The first three-phase AC transmission line in North America was put into operation in (1893).3. Power system intercon
25、nections are usually formed at the (transmission system) level.4. In North American (60Hz) is adopted as standard frequency in electric power system.5. (The HVDC transmission) can provide an asynchronous link between two ac electric power systems with different nominal frequencies.6-2(P122)1. In pow
26、er plants (prime movers) convert the primary energy to mechanical energy, and (synchronous generators) convert mechanical energy to electric energy.2. The generator voltages are usually stepped up to the transmission voltage level by (step-up transformers)3. Residential and commercial customers are
27、supplied by the secondary distribution feeders at (220/380V).4. In USA, the voltages of the transmission system are typically (230kV and above)6-3(P130)1. The objective of the optimal economic operation of power systems is (to minimize the total production cost).2. The frequency of a power system is
28、 determined mainly by (active power generation and consumption).3. The voltage levels at the terminals of generators are controlled mainly by (automatic voltage regulators).4. When the system frequency is changed away from the rating, (active power) must be regulated.5. Regulation of the generators
29、speed governor can change its (active power) output.7-2(P148)1. At the fault point in electrical equipment, there may be (all of the above).2. Among the following faults on a transmission line, the most severe one is usually the (3-0 fault).3. Among the following faults on a transmission line, the m
30、ost common one is the (single line to ground fault).4. The most common fault in the generators stator winding is (phase to ground fault).5. If generator overspeed occurs in a thermal power plant, the action most possibly undertaken is (to shut off the steam).7-3(P152)1. The use of transformer oil in
31、 a minimum-oil circuit breaker is (to quench the arc and establish an insulated break between the contacts)2. A circuit breaker mainly consists of (three) parts.3. The air-blast circuit breaker makes use the arc-quenching properties of (dry and clean compressed air).4. The reason that the SF6 circui
32、t breaker is widely used is (the excellent arc quenching and insulating).5. Vacuum-bottle interrupters are designed for (higher system voltage, current).8-2(P171)1. In hydropower plants, (Francis turbines) are frequently used for medium heads.2. During times of the off-peak load, a pumped-storage pl
33、ant should (absorb energy from the power network),3. The overall efficiency of a pumped storage plant is usually about (65%70%).4. The start-up speed of a hydropower plant is (faster than) that of a thermal plant.5. The hydropower is well suited for switching according to (a dispatchers) an operators奔波在俗世里,不知從何時起,飄來一股清流,逼著每個人優(yōu)秀。人過四十,已然不惑。我們聽過別人的歌,也唱過自己的曲,但誰也逃不過歲月的審視,逃不過現(xiàn)實的殘酷。如若,把心中的雜念拋開,茍且的日子里,其實也能無比詩意。借一些時光,尋一處寧靜,聽聽花開,看看花落,翻一本愛讀的書
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