Power Source, Outlet, Socket
noun
The electricity origin is where the electricity comes from. It is the power source.
でんげん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
出かける時は、完全に電源を切るために全部のコンセントを抜きます。
When I go out, I turn off all the power by unplugging everything from the electrical sockets.