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Getting Started with Arduino, 2nd Edition by Massimo Banzi

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Appendix B. Reading Resistors and Capacitors

In order to use electronic parts, you need to be able to identify them, which can be a difficult task for a beginner. Most of the resistors that you find in a shop have a cylindrical body with two legs sticking out and have strange coloured markings all around them. When the first commercial resistors were made, there was no way to print numbers small enough to fit on their body, so clever engineers decided that they could just represent the values with strips of coloured paint.

Today’s beginners have to figure out a way to interpret these signs. The “key” is quite simple: generally, there are four stripes, and each colour represents a number. One of rings is usually gold-coloured; this one represents ...

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