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9 6 50ma 30ma - PowerPoint PPT Presentation

9.4 ?????????

i. +. ? ?. u. _. 9.4 ?????????. ???????????? ( u, i ??). 1. ???? ( instantaneous power ). 2. ???? ( average power ) P. P ???? W ???. cos ? ? ?????. ? = ? u - ? i ? ???????????????????????. 1, ???. cos j. 0 ? ???. X >0, j >0 , ???. X <0, j <0 , ???.

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9.4 ?????????