# Building Systems - Electricity

**URL:** <https://community.blackspectacles.com/t/building-systems-electricity/2574>\
**Category:** Project Planning & Design\
**Created:** [February 18, 2021, 10:51pm UTC](https://community.blackspectacles.com/t/building-systems-electricity/2574 "2021-02-18T22:51:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![silk69](https://blackspectacles.com/uploads/images/1.png) [@silk69](https://community.blackspectacles.com/u/silk69)\
**Post date:** [February 18, 2021, 10:51pm UTC](https://community.blackspectacles.com/t/building-systems-electricity/2574/1 "2021-02-18T22:51:53Z")

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I am watching this video and Mike says that our computers and houses use DC current. Homes use AC current not DC.

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**Author:** ![coachchrishopstock](https://yyz1.discourse-cdn.com/flex029/user_avatar/community.blackspectacles.com/coachchrishopstock/32/1662_2.png) [@coachchrishopstock](https://community.blackspectacles.com/u/coachchrishopstock)\
**Post date:** [March 17, 2021, 9:36pm UTC](https://community.blackspectacles.com/t/building-systems-electricity/2574/2 "2021-03-17T21:36:52Z")

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Hey @silk69 - You’re right, in the U.S. our electricity is predominately powered by alternating current (AC).  
I think the video you’re referring to is titled ‘Building Systems - Electricity’. In this video, Mike is talking about how some devices that we use daily (such as computers) use direct current (DC). This is why most computer chargers have a small transformer on them - to transform from AC to DC current.