How to Connect Multiple LEDs in Series - Electronics for Absolute Beginners
This video describes how to connect four LEDs in series with a resistor, powered by a 9 V battery.
Quick Start Workbook Channel
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Quick Start Workbooks are easy-to-follow, tutorial-style books that are designed to give you hands-on experience of using a particular software application or technology, for example, electronics. As well as the books themselves, there is an accompanying website (https://www.quickstartworkbook.com) that contains sample videos and in some cases downloadable files, which correspond to chapters in the books.
The combination of a book and a website means that you not only have access to step-by-step instructions on how to carry out a particular task, but also videos that show what the task should look like or achieve if carried out successfully. All this provides you with the full package to quickly get you up to speed with the task at hand.