Read e-book online Allgemeine Elektrotechnik: Grundlagen der Gleich- und PDF

By Manfred Krause, Alexander von Weiss

ISBN-10: 3322895726

ISBN-13: 9783322895721

ISBN-10: 3528341858

ISBN-13: 9783528341855

Behandelt werden die allgemeinen Grundlagen der Gleich- und Wechselstromlehre, die allen Zweigen der Elektrotechnik angehören, die Voraussetzung fürden Einstieg in das Fachstudium bilden und das Verständnis für die Welt der theoretischen Elektrotechnik vorbereiten.

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Additional info for Allgemeine Elektrotechnik: Grundlagen der Gleich- und Wechselstromlehre

Example text

12. Vier Widerstände, R 1 = 70 n, R 2 = 13 n, R 3 =40 n, R 4 = 25 n sind in Reihe geschaltet und an eine Spannung U = 220 V angeschlossen. Gesucht sind der Strom I und die Teilspannungen U1 bis U4 an den einzelnen Widerständen. Lösung: Der Gesamtwiderstand der Reihenschaltung wird Damit wird der Strom I Die Teilspannungen betragen U1 =R 1 U/R=R 1 l = 70n'I,49A~104V, U2 =R 2 U/R=R 21 = 13n'I,49A~ 19V, U3 =R 3 U/R =R 31 = 40n'I,49A~ 60V, U4 =R 4 U/R =R 4 1 = 25 n '1,49 A ~ 37 V. 13. 16 sind 1-2 die Eingangsklemmen und 3-4 die Ausgangsklemmen einer mit dem Widerstand R belasteten Widerstandsanordnung (Vierpol).

C = 2 A und die Quellenspannung U= 3 V. R 1 = 2 n, R 2 = 3 n, R 3 = 1 n. Es sind der abfließende Laststrom 1b und die Zweigströme 11 ,! 3 zu berechnen. Lösung: Der erste Kirchhoffsche Satz GI. 11) ergibt zunächst als Summe der zufließenden Ströme I b =Ia + I c = 5 A. Das Netzwerk hat p = 3 Knotenpunkte. Man erhält daher p - 1 = 2 Knotengleichungen 1. Knotenpunkt a: la = 1 1 -/3 2. Knotenpunkt c: 1c = 12 + 1 3 und nach der Maschenregel in der eingezeichneten Umlaufrichtung als Maschengleichung 3.

Der innere Widerstand bestimmt aber auch die Größe des einer Zweipolquelle entnehmbaren Stromes insbesondere die Größe des Kurzschlußstromes 1k . Einem niederohmigen Verbraucher R = 0,5 n liefert eine Quelle mit Uq = 6 V, R i = 5 n einen Strom von 1 1 = 1,09 A. Eine Quelle mit Uq = 1 V aber mit einem Innenwiderstand R i = 0,01 n liefert dagegen dem gleichen Verbraucher einen Strom von 12 = 1,96 A. Trotz sechsfacher Spannung Uq ist h nur 56 % von 12. 26 2 Grundbegriffe und Grundgesetze des Gleichstroms Im Kurzschluß (R = 0) wird die Quellenspannung vollständig als innerer Spannungsabfall am inneren Widerstand verbraucht.

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Allgemeine Elektrotechnik: Grundlagen der Gleich- und Wechselstromlehre by Manfred Krause, Alexander von Weiss

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