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Electric Transmision of Energy, and Its Transformation, Subdivision, and Distribution by Gisbert Kapp - Paperback
105.00 درهم

Electric Transmision of Energy, and Its Transformation, Subdivision, and Distribution by Gisbert Kapp - Paperback

كن أول من يقيِّم هذا المنتج 

105.00 درهم 

  - ستوفر -105.00 درهم
الأسعار تشمل ضريبة القيمة المضافة  التفاصيل
الشحن مجاني التفاصيل
رقم ال ISBN
9781130440720
الفئات
تاريخ
الكاتب
Gisbert Kapp
الناشر
Rarebooksclub.com
الوصف:

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...easily be seen which is the best. We suppose that the resistance of the line is given. The electrical data thus obtained can only be regarded as a first approximation to a solution of ...

تشحن من الولايات المتحدة
اشحن الى دبي (تغيير المدينة)
التوصيل خلال الأحد ١٠ يونيو - الثلاثاء ١٢ يونيو الي دبي

حالة السلعة:
جديدة
البائع:
InternationalBookStore (87% تقييم ايجابي)

معلومات المنتج

  •  

    المواصفات

    رقم ال ISBN
    9781130440720
    الفئات
    تاريخ
    اللغات
    الانجليزية
    الرقم المميز للسلعة
    2724353261168
    المؤلفين
    الكاتب
    Gisbert Kapp
    رقم ال ISBN
    9781130440720
    الفئات
    تاريخ
    اللغات
    الانجليزية
    الرقم المميز للسلعة
    2724353261168
    المؤلفين
    الكاتب
    Gisbert Kapp
    المؤلفين
    الناشر
    Rarebooksclub.com
    معلومات تقنية
    غلاف الكتاب
    غلاف عادي
    اللغات والبلدان
    لغة الكتاب
    الانجليزية
    إقرأ المزيد
  •  

    الوصف:

    This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...easily be seen which is the best. We suppose that the resistance of the line is given. The

    This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...easily be seen which is the best. We suppose that the resistance of the line is given. The electrical data thus obtained can only be regarded as a first approximation to a solution of the problem, because they were obtained on the basis of the highest electrical efficiency, whereas the question of importance is the actual or commercial efficiency. It is sometimes assumed that the commercial efficiency of dynamos and motors bears a fixed proportion to their electrical efficiency, and if that were so we could obtain the actual efficiency of our system of transmission by multiplying equation 31) with that fixed proportion. But this would not be correct. It is evident that the commercial efficiency of a motor cannot be a fixed quantity, but must depend on the power given out, being, generally speaking, the higher the nearer the work done by the motor approaches to the maximum for which it is designed. This relation is best expressed in the manner adopted in Chapter V., by assuming that a certain minimum of current, 7, is necessary to overcome the mechanical and magnetic friction of the motor, and that all the power corresponding to the difference between this minimum and the actual working current is available for external work. Similarly we assume that a certain minimum of current, gt multiplied by the internal electro-motive force of the generator, represents the mechanical energy absorbed by mechanical and magnetic friction. We have, therefore, the following relations: motive force for which the commercial efficiency becomes a maximum. To find these values we form the first differential quotient and equate it to zero. Thus the most favourable current will be found by the equation Work given out, w = (c--y) ea. Put Ra + Rm = R, and ra + rm = r, then for serie.

    خصائص المنتج:
    • الفئات: تاريخ
    • غلاف الكتاب: غلاف عادي
    • لغة الكتاب: الانجليزية
    • الكاتب: Gisbert Kapp
    • الناشر: Rarebooksclub.com
    • رقم ال ISBN: 9781130440720
    • عدد الصفحات: 90
    • لأبعاد (الارتفاع*العرض*العمق): 9.69 x 7.44 x 0.19 inches
 

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