电气专业英语的在线翻译，求！

电气专业英语的在线翻译，求！

fig.1-11ashows一二端电气元件。一个终端标记有一点证据的目的。三个变量和两个相关的线索。一元之间，使电压。它被标记的U +底部上topand。两个变量在每个引领潮流。如果在前引导islabeled我和进入箱如图所示，则电流，用基尔霍夫电流定律，在底部引线电流必须我，并且必须从盒子里出来。如果这种情况的了解，不需要显示在底部的电流引线。因此，只有两个变量，你和我，都与一个端元。在1-11个虚线左边意味着元素连接到另一个电路。元件的特点，如果我们能确定你我之间的功能关系。如果我们获得有关你我的表达，我们已经确定的数学模型，或方程，为代表的终端特性的元素。事实上，这个功能是用来定义元素的关系。看到和我是相关的，我们测量的U和我不同的价值观和情节并显示在fig.1-11b。然后我们试着描述这条曲线的数学。如果这是一个简单的曲线，如直线，很容易写出来的曲线，从而建立函数关系你和我在某些情况下，我们能做的只有在limitedrange的变量，所以我们可以只有你和我呆在这个范围的变量建立数学模型，对元。在其它情况下，我们也许能够拟合曲线数学中的两个或两个以上的separateranges的变量，从而表征元与两个或两个moremodels，每一个范围，在其他情况下，我们可能无法obtainan精确模型的所有元素。这并不意味着这些元素是无用的而不是一件容易的任务，使用与其他元素和预测结果会是什么。事实上，制造商和元素的设计师尝试生产装置thatobeys简单数学使电路性能可以很容易地影响

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Fig.1-11a
shows a two-terminal electrical element. One terminal is marked with a dot for
identification purposes. Three variables are associated with the two leads. One
variable is the voltage between the leads. It is labeled u with + on the top
and —on the bottom. The other
two variables are the currents in each lead. If the current in the top lead is
labeled i and is taken into the box as shown, then, by Kirchhoff’s Current Law,
the current in the bottom lead must be i, and is must be coming out of the box.
If this situation is understood, it is not necessary to show the current in the
bottom lead. Consequently, only two variables, u and i, are associated with a
two-terminal element. In Fig.1-11 a the broken lines on the left imply that the
element is connected to another circuit.
The element
is characterized if we can determine the functional relationship between u and
i. If we obtain an expression relating u to i, we have determined a
mathematical model, or equation, to represent the terminal characteristics of
the element. Indeed, this functional relationship is used to define the
element.
To see how u
and i are related, we measure u and i for different sets of values and plot a
graph as shown in Fig.1-11b. We then try to describe this curve mathematically.
If it is a simple curve, such as a straight line, it is easy to write the
equation for the curve, thereby establishing the functional relationship
between u and i. In some cases, we may be able to do so only over a limited
range of the variables, and therefore we can establish a mathematical model for
the element only if the u and i variables stay within that range. In other
cases, we may be able to fit the curve mathematically in two or more separate
ranges of the variables, thereby characterizing the element with two or more
models, one for each range, In still other cases, we may not be able to obtain
an accurate model for the element at all. This does not mean that such an
element is useless but rather that it is not going to be an easy task to use it
with other elements and predict what the outcome will be. Indeed, the
manufacturer and the designer of the elements try to produce a device that
obeys simple mathematical so that its performance in a circuit can easily be
predicted

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