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電氣工程及其自動化專業(yè)英語
應該注意：一個理想電壓源(獨立或受控)可向電路提供任意電流以保證其端電壓為規(guī)定值，而電流源可向電路提供任意電壓以保證其規(guī)定電流。A different class of relationship occurs because of the restriction that some specific type of network element places on the variables.Still another class of relationship is one between several variables of the same type which occurs as the result of the network configuration,i.e.,the manner in which the various element of the network are interconnected.一種不同類型的關系是由于網(wǎng)絡元件的某種特定類型的連接對變量的約束。
另一類關系由于網(wǎng)絡結構，即網(wǎng)絡的不同元件互相連接的方式所產生的相同形式的一些變量間的關系。1.A resistor whose resistances vary with its current is known as a nonlinear resistor.
2.An open circuit is a circuit element with resistance approaching infinity.
3.3.An electric heater draws 10A form a 120V line.The resistance of the heater is 12Ω.
4.An ideal dependent source is an active element in which the source quantity is controlled by another voltage or current.
5.An independent voltage source is a two-terminal element,which maintains a specified voltage between its terminals.
6.According to the passive sign convention,if the power has a plus sign,power is absorbed by the element.
7.Electric current is the time rate of charge,measured in amperes.
8.For a circuit containing N nodes and M branches,there will be N-1 independent node voltage.
9.For a voltage source,its terminal voltage is known but its current must be determined by the external circuit connecting with it.
10.If in an acb phase sequence,Uan=100∠-20°,then Ubn is 100∠100°.
11.It is conventional to take the current flow as the movement of positive charges.
12.Kirchhoff’s laws are that are based on the topology of the network.
13.Kirchhoff’s current law can be stated in two ways.
14.Kirchhoff’s current law is based on the law of conservation of charge.
15.Kirchhoff’s voltage law is based on the law of conservation of energy.
16.Mesh analysis applies KVL to find unknown currents which are mesh currents.
17.Nodal analysis is based on a systematic application of KCL,and satisfies automatically KVL.
18.Nodal analysis method is choosing node voltages as circuit variables.
19.Ohm’s law states that the voltage across a resistor is directly proportional to the current flowing through the resistor.
20.Resistors are passive elements.
21.The plus(+)and minus(-)signs in an electric circuit diagram are used to define voltage polarity.
22.There are four possible types of dependent source.
23.The circuit element used to model the current-resisting behavior of a material is the resistor.
24.The algebraic sum of all voltage around a loop is zero.
25.The potential at reference node or datum node is zero in nodal analysis.
26.The energy required to move a unit charge through an element is voltage.
27.The voltage across an inductor eads the current through it by 90°.
28.The voltage across an capacitor lags the current through it by 90°.
29.The three-phase source and the three-phase load have four possible connections.
30.The three voltages that have the same amplitude and frequencyωand are out of phase with each other by 120°are said to be balanced three-phase voltage.
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