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Elektronik Grundlagen – Teil 2: der elektrische Widerstand « Physical Computing

Elektronik Grundlagen – Teil 2: der elektrische Widerstand

Der elektrische Widerstand

Jedes Bauteil, dass man in einem Stromkreis unterbringt, hat einen eigenen Widerstand. Es handelt sich, wenn wir am Wasserbeispiel bleiben wollen, um einen Engpass, durch den sich das Wasser zwängen muss.

Das Bauteil verbraucht auch einen bestimmten Teil der Spannung, sodass hinter dem Bauteil nicht mehr die volle Spannung zur Verfügung steht, wie man sie anfangs angelegt hat.

Der elektrische Widerstand berechnet sich aus R=U/I. Eine LED mit einer Stromaufnahme von 0,02 A und einer Spannung von 3 V hat also einen Widerstand von 3V/0,02A = 150 Ohm (Ω).

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