http://www.diffen.com/difference/Alternating_Current_vs_Direct_Current
http://blueskai.tistory.com/m/13
http://cuplltoday.tistory.com/301
https://medium.com/@youngji/%EC%A7%81%EB%A5%98%EC%99%80-%EA%B5%90%EB%A5%98%EC%9D%98-%EC%9B%90%EB%A6%AC-9ca292389d63
http://shindonga.donga.com/Library/3/06/13/111141/1
http://near-u.tistory.com/16
https://namu.wiki/w/%EA%B5%90%EB%A5%98
- AC의 임피던스 와 어드민터스
https://ko.m.wikipedia.org/wiki/%EC%98%A8%EC%A0%80%ED%95%AD
https://ko.m.wikipedia.org/wiki/%EC%96%B4%EB%93%9C%EB%AF%B8%ED%84%B4%EC%8A%A4
https://ko.m.wikipedia.org/wiki/%EB%B0%98%EC%9D%91%EC%A0%80%ED%95%AD
http://codens.info/m/179
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