En komponents resistans
R er komponentens resistans, når U er spændingsfaldet over komponenten, og I er strømstyrken gennem den.
\(R = \frac{U}{I}\)
Ohms lov for en resistor
(I,U)-karakteristikken for en resistor er en ret linje gennem begyndelsespunktet. Den rette linjes hældningskoefficient er resistorens resistans R:
\(U = R \cdot I\)
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