{"guid":"71d96878-1a9f-507c-95b2-701eca71d540","title":"Electrical energy, explained","subtitle":null,"slug":"denog12-61-electrical-energy-explained","link":"https://pretalx.denog.de/denog12/talk/SVV7PS/","description":"We all use a lot of power, but most of us never had the chance to actually understand the underlying basics of electrical energy when it comes to data centers.\n\nThings you will take away from this:\n* What is capacitative load and why is it different from inductive and resistive?\n* Why is 3 * 230V = 400V?\n* Why do you need minimum distance between large wires?\n* Why is V * A != Watt? And why is V * A == Watt? Wait, what Watt? Wat?\n* How do you get a blacked-out datacenter back online after a complete power outage, just from diesel gensets?","original_language":"eng","persons":["Richard Hartmann"],"view_count":56,"promoted":false,"date":"2020-11-10T09:00:00.000+01:00","release_date":"2021-01-13T00:00:00.000+01:00","updated_at":"2025-10-27T21:45:05.190+01:00","tags":["denog12","61","2020"],"length":1813,"duration":1813,"thumb_url":"https://static.media.ccc.de/media/events/denog/denog12/61-71d96878-1a9f-507c-95b2-701eca71d540.jpg","poster_url":"https://static.media.ccc.de/media/events/denog/denog12/61-71d96878-1a9f-507c-95b2-701eca71d540_preview.jpg","timeline_url":"https://static.media.ccc.de/media/events/denog/denog12/61-71d96878-1a9f-507c-95b2-701eca71d540.timeline.jpg","thumbnails_url":"https://static.media.ccc.de/media/events/denog/denog12/61-71d96878-1a9f-507c-95b2-701eca71d540.thumbnails.vtt","frontend_link":"https://media.ccc.de/v/denog12-61-electrical-energy-explained","url":"https://api.media.ccc.de/public/events/71d96878-1a9f-507c-95b2-701eca71d540","conference_title":"DENOG12","conference_url":"https://api.media.ccc.de/public/conferences/denog12","related":[],"recordings":[{"size":250,"length":1813,"mime_type":"video/webm","language":"eng","filename":"denog12-61-eng-Electrical_energy_explained_webm-hd.webm","state":"new","folder":"webm-hd","high_quality":true,"width":1920,"height":1080,"updated_at":"2021-01-13T13:34:39.842+01:00","recording_url":"https://cdn.media.ccc.de/events/denog/denog12/webm-hd/denog12-61-eng-Electrical_energy_explained_webm-hd.webm","url":"https://api.media.ccc.de/public/recordings/50977","event_url":"https://api.media.ccc.de/public/events/71d96878-1a9f-507c-95b2-701eca71d540","conference_url":"https://api.media.ccc.de/public/conferences/denog12"},{"size":86,"length":1813,"mime_type":"video/webm","language":"eng","filename":"denog12-61-eng-Electrical_energy_explained_webm-sd.webm","state":"new","folder":"webm-sd","high_quality":false,"width":720,"height":576,"updated_at":"2021-01-13T13:21:02.752+01:00","recording_url":"https://cdn.media.ccc.de/events/denog/denog12/webm-sd/denog12-61-eng-Electrical_energy_explained_webm-sd.webm","url":"https://api.media.ccc.de/public/recordings/50933","event_url":"https://api.media.ccc.de/public/events/71d96878-1a9f-507c-95b2-701eca71d540","conference_url":"https://api.media.ccc.de/public/conferences/denog12"},{"size":54,"length":1813,"mime_type":"video/mp4","language":"eng","filename":"denog12-61-eng-Electrical_energy_explained_sd.mp4","state":"new","folder":"h264-sd","high_quality":false,"width":720,"height":576,"updated_at":"2021-01-13T13:13:17.650+01:00","recording_url":"https://cdn.media.ccc.de/events/denog/denog12/h264-sd/denog12-61-eng-Electrical_energy_explained_sd.mp4","url":"https://api.media.ccc.de/public/recordings/50898","event_url":"https://api.media.ccc.de/public/events/71d96878-1a9f-507c-95b2-701eca71d540","conference_url":"https://api.media.ccc.de/public/conferences/denog12"},{"size":27,"length":1813,"mime_type":"audio/mpeg","language":"eng","filename":"denog12-61-eng-Electrical_energy_explained_mp3.mp3","state":"new","folder":"mp3","high_quality":false,"width":0,"height":0,"updated_at":"2021-01-13T13:10:19.302+01:00","recording_url":"https://cdn.media.ccc.de/events/denog/denog12/mp3/denog12-61-eng-Electrical_energy_explained_mp3.mp3","url":"https://api.media.ccc.de/public/recordings/50896","event_url":"https://api.media.ccc.de/public/events/71d96878-1a9f-507c-95b2-701eca71d540","conference_url":"https://api.media.ccc.de/public/conferences/denog12"},{"size":16,"length":1813,"mime_type":"audio/opus","language":"eng","filename":"denog12-61-eng-Electrical_energy_explained_opus.opus","state":"new","folder":"opus","high_quality":false,"width":0,"height":0,"updated_at":"2021-01-13T13:10:03.781+01:00","recording_url":"https://cdn.media.ccc.de/events/denog/denog12/opus/denog12-61-eng-Electrical_energy_explained_opus.opus","url":"https://api.media.ccc.de/public/recordings/50895","event_url":"https://api.media.ccc.de/public/events/71d96878-1a9f-507c-95b2-701eca71d540","conference_url":"https://api.media.ccc.de/public/conferences/denog12"},{"size":137,"length":1813,"mime_type":"video/mp4","language":"eng","filename":"denog12-61-eng-Electrical_energy_explained_hd.mp4","state":"new","folder":"h264-hd","high_quality":true,"width":1920,"height":1080,"updated_at":"2021-01-13T13:07:46.912+01:00","recording_url":"https://cdn.media.ccc.de/events/denog/denog12/h264-hd/denog12-61-eng-Electrical_energy_explained_hd.mp4","url":"https://api.media.ccc.de/public/recordings/50890","event_url":"https://api.media.ccc.de/public/events/71d96878-1a9f-507c-95b2-701eca71d540","conference_url":"https://api.media.ccc.de/public/conferences/denog12"}]}