Lesson 2, Topic 2
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2.2 What is Ohms Law?

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Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperature remain constant.



In the equation, the constant of proportionality, R is Resistance and has units of ohms, with symbol Ω.

The same formula can be rewritten in order to calculate the current and resistance respectively as follows:

I= V/R


R= V/I

Ohm’s law only holds true if the provided temperature and the other physical factors remain constant.