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Kufper- und Eisenkabel

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That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:

Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise

Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise

Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise

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Level 5 -
Level 6 -

Exercise

https://texercises.com/exercise/kufper-und-eisenkabel/

Question

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The following quantities appear in the problem: Länge \(\ell\) / elektrischer Widerstand \(R\) / Fläche \(A\) / spezifischer elektrischer Widerstand \(\rho\) /

The following formulas must be used to solve the exercise: \(R = \varrho \dfrac{\ell}{A} \quad \)

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Exercise:
Ein Kupferkabel mit einem Querschnitt A_textrmCu von pqmm^ habe einen Widerstand von pqOmega. abcliste abc Wie lang ist das Kabel? abc Es soll ein Eisenkabel gleicher Länge und mit gleichem Widerstand hergestellt werden. Wie gross ist sein Querschnitt? abcliste

Solution:
abcliste abc Kupfer hat einen spezifischen elektrischen Widerstand von rhoelCu rhoelCuNum refSpezifischerElektrischerWiderstand. Aus RrhoelCufraclA ergibt sich damit für die Länge des Kabels l fracRArhoelCu fracpqOmega pqm^rhoelCuNum pq.m . abc Nun lösen wir die Formel für den Widerstand eines Leiters nach dem Querschnitt auf; es ergibt sich A rhoel fraclR . Hier setzen wir nun die numerischen Werte ein. Für Eisen gilt rhoelFe rhoelFeNum. Also A rhoelFeNum fracpq.mpqOmega pq.m^ pq.mm^ . abcliste

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Contained in these collections:

Elektrischer Widerstand Leiter by TeXercises

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Tags	eines, eisen, gleichstromlehre, kabel, kupfer, leiters, leiterwiderstand, ohm'sches, physik, querschnitt, spezifischer, widerstand
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Difficulty	(1, default)
Points	4 (default)
Language	(Deutsch)
Type	Calculative / Quantity
Creator	uz
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