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Date: 14-10-2020
1011
Date: 22-12-2020
1751
Date: 22-12-2020
1549
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VECTOR REPRESENTATION OF IMPEDANCE
Any impedance Z can be represented by a complex number R + jX, where R can be any nonnegative real number and X can be any real number. Such numbers can be plotted as points in the RX half-plane or as vectors with their end points at the origin (0+j0). Such vectors are called impedance vectors.
Imagine how an impedance vector changes as either R or X or both are varied. If X remains constant, an increase in R causes the vector to get longer. If R remains constant and XL gets larger, the vector also grows longer. If R stays the same as XC gets larger (negatively), the vector grows longer again. Think of point representing R+ jX moving around in the plane, and imagine where the corresponding points on the resistance and reactance axes lie. These points can be found by drawing straight lines from the point R+ jX to the R and X axes so that the lines intersect the axes at right angles. This is shown in Fig. 1 for several different points. Now think of the points for R and X moving toward the right and left or up and down on their axes. Imagine what happens to the point R+ jX and the corresponding vector from 0 + j0 to R+ jX in various scenarios. This is how impedance changes as the resistance and reactance in a circuit are varied.
Fig. 1. The RX impedance half-plane showing some points for specific complex-number impedances.
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الآثار الجانبية لأدوية تستخدم في علاج "ألزهايمر" تثير الجدل
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اكتشاف سر نجاة "مخلوقات أبدية" من انفجارات الإشعاع القاتلة
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موكب أهالي كربلاء يهدي ممثل المرجعية العليا درعا تثمينا للمساهمات الفاعلة والمساندة لإنجاح الفعاليات التي يقيمها خلال المناسبات الدينية
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مراحل متقدمة من الإنجاز يشهدها مشروع مركز الشلل الدماغي في بابل
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الأمين العام للعتبة الحسينية المقدسة: يجب الاهتمام بالباحثين عن العمل ومنحهم الفرص المناسبة عبر الاهتمام بقدراتهم ومؤهلاتهم وإبداعاتهم
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يمتد على مساحة (500) دونم ويستهدف توليد الطاقة الكهربائية.. العتبة الحسينية تعلن عن الشروع بإنشاء مشروع معمل لتدوير النفايات في كربلاء
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