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Arduino Development Cookbook by Cornel Amariei

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Ohm's law

Electronics is all related to Ohm's law. This provides the relation between voltage, current, and resistance in a circuit. The law states that the current passing through a resistor is directly proportional to the applied voltage across it. In mathematical forms, it looks like this:

Ohm's law

A simple way to remember and apply it according to either of the variables is the following triangle:

Ohm's law

If we want to find the current, we cover I and we get V divided by R. The same goes for R: we cover it and we obtain V divided by I. Lastly, V will equal I multiplied ...

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