Current, Voltage, and Resistance
To build your first projects with the Arduino, you didn’t need to know much about electricity. But at some point, you’ll need to understand what current, voltage, and resistance are all about. For example, you already know that you always have to put a resistor in front of an LED, but you might not know exactly why, and you might not know how to calculate the resistor’s size for a given LED. Let’s remedy that.
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