Puput Dani'e

http://www.etotheipiplusone.net/?cat=89

https://www.youtube.com/watch?v=up1d_fagy6Q

http://teknikelektronika.com/pengertian-daya-listrik-rumus-cara-menghitung/

http://www.blogteknisi.com/2017/03/Contoh-Soal-dan-Rumus-Gelombang-dalam-Ilmu-Fisika.html#