Ohm's law
Ohm's law is a fundamental concept to try and understand before you venture into the prototyping world. One of the main reasons Ohm's law is so widely misunderstood is because it has various equations that originate from a single, mathematical equation.
You can find more information about this diagram and Ohm's law in Chapter 9, Running Your Pi from a Battery's Power Source. I have included this diagram here for quick reference as I will demonstrate how to use some of the provided equations:
How much power?
In Ohm's law, power (W) is know as watts. Understanding how to calculate watts is pretty much the most important question that you should ...
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