Introducing Divs and controlling them with classes and ids

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We've talked about AC Circuits, but now it's time to delve into the world of AC Circuits (or alternating currents). We’ve talked about how they change voltage, which helps transmit electricity over long distances, but there’s so much more to the physics of AC circuitry. • -- • Produced in collaboration with PBS Digital Studios:    / pbsdigitalstudios   • -- • Want to find Crash Course elsewhere on the internet? • Facebook -   / youtubecrashc.  . • Twitter -   / thecrashcourse   • Tumblr -   / thecrashcourse   • Support CrashCourse on Patreon:   / crashcourse   • CC Kids:    / crashcoursekids  

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