Ohm's law

The most important law related to electrical circuits and is consequently needed for almost every electricity exam question!


Key Concepts

Ohm's law states that potential difference across a conductor is proportional to the current flowing through the conductor, provided that temperature remains constant.

Substituting the proportional sign, we end up with an equation for resistance:

\(V \propto I\)

\(V=RI\)

The following results show an example of a non-Ohmic conductor:

Test Yourself

Use quizzes to practise application of theory.  


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