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Spannung und Strom « Physical Computing

Spannung und Strom

Elektronen, die durch einen Leiter fließen können Arbeit verrichten (LEDs können leuchten, Motoren können sich drehen). Man spricht von elektrischer Energie. Damit sich Elektronen bewegen ist ein Potentialunterschied nötig. Auf der einen Seite muss ein Elektronenüberschuss (GND oder Minus-Pos), auf der anderen Seite ein Elektronenmangel (5V+ oder Plus-Pol) vorliegen.

Der Elektrische Strom (I) bezeichnet die Anzahl der Elektronen, die durch den Leiter fließen, die Spannung (V) gibt Aussage über die Geschwindigkeit der Elektronen.

Der elektrische Widerstand (R) bezeichnet den Grad, in dem die Elektronen am Durchfluss behindert werden. Er ergibt sich aus: R=U/I. Der Widerstand wird in Ohm, der Strom in Ampere bzw. Milliampere und die Spannung in Volt angegeben.

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