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tIi sin2 设设：则：则：IRUtUuRRR ； sin2LLLLIXUtUu ；)90sin(2o CCCCIXUtUu ；)90sin(2o CLRUUUU CUULUIRUCUXU CLXUUU XRUU RLCRuLuCu+- -+- -+- -+- -ui由由KVL：)sin(2 tUuuuuCLRLUICLUUURU( 0 感性感性)XL XCCUIRU( 0 容性容性)XL XC CULUCLUUU RjXL-jXCRU+_LU+_CU+_U+_IULUCUCI UR U( = 0 阻性阻性)XL = XCCUULUIRUCUXU 2222)(CLRXRUUUUUU RCLRXUUUUU arctanarctan )sin(2 tUuuuuCLRCLXX 0 CLXX 0 CLXX 0 ZIXXRIIXIXIRUUUUCLCLCLR 222222)()()()(ZUI 22)(CLXXRZ ZIXXRIIXIXIRUUUUCLCLCLR )( j)j(j抗抗)( jCLXXRZZUI ZIUIUIUZiuiu