Physik – einfacher Stromkreis?

Wie ist die Aufgabe gemeint? Unser Lehrer sagte, man muss die Länge mal zwei nehmen, aber wieso?

Ein Verbraucher ist über eine 500 m vom Speisepunkt entfernte, 3 mm dicke Aluminiumleitung (Aluminium: rho = 0, 286 ohm x mm^2/m) mit der Spannungsquelle verbunden. Bei Belastung mit I = 5A beträgt die Klemmspannung 189,8 V. Wie groß ist die Klemmspannung bei Belastung mit I= 10 A?

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TomRichter
1 year ago

> one must take the length once two

No. You must the distance take two, then you get the length of the wire through which the current must flow.

willi55
1 year ago

Look at the unit of rho. … there is …/m, so per meter. If the consumer is 500 m away from the power source, you need 1000 m cable. Of course you have the resistance of 1000 m cable.

Gehilfling
1 year ago

you have to take the length of two, but why?

Because the current flows and back. In this way you need the length twice.

Gehilfling
1 year ago

Yes. You have the line resistance from the information, and you need 2x. In addition, the consumer. So you have a series connection of 2x of the line and an unknown consumer.

Gehilfling
1 year ago

You have a line 500x to the consumer with a resistor R, then a consumer, then a line 500m back to the source with a resistor R. Insofar 2x the line resistor R.

SevenOfNein
1 year ago

Because the power has to go back and forth