1、m( )cos()f tFt0m( )cos()f tFt0()( )2cos()f tFtmm1,22FFFF0+1+j.0+1+j.m2FFFF符号说明瞬时值瞬时值 - 小写小写u、i有效值有效值 - 大写大写U、I复数、相量复数、相量 - 大写大写 + “.”U振幅振幅 - 大写大写+ +下标下标mU.RIRURUuRIRUiRI. t0uR(t),iR(t),pR(t)2cos()RRiiIt2cos()RRiuUtLLi.iLuL 90.0iL(t),uL(t) t.LILUj LLLILIUiLILUu( )2sincossin2LLLLLLLp tuiUtItU It t0uL,
2、 iL,pL2cosLLiIt2sinLLuUt 0LP .100mH,50Hz,Lf7 2cosAit12730 VU IUICqCu.90.0uC,iC t.CICU1j CiCICUuCU t0uC,iC, pC( )2sincossin2CCCCCCCptuiUtItU It2cosCCiIt2sinCCuUt0CP 1F,70.7 2cos(314)V,6CutUI3060.UIjkUIR1R2CLus(t)iL(t)iL(t).R1R2.sULILI1j Cj L正误判断正误判断Rui ？RUi RUI ？瞬时值瞬时值有效值有效值正误判断正误判断？dduiLtLuiLUIjULIL
3、jIU？ 正误判断正误判断CuimmIj CUIj CUICUCjIU？ 答案答案.UIUIiuIUZ）R|ZX 00 0 RRRUZRIiRURIuRIRU.RIRUiLULIujjLLLLUZLXILXL.LILUj LiCUCIu1jjCCCCUZXCI 1CXC .CICU1j C.UIiu IYU |YGB.UI 2UR221j C11j C2mg U.ZabUI j jRLLCCUI RUIXUIX0IIRjXLU+_+_IRULUCUjXCLCXXRjXLU+_+_IRULUCUjXCCUULUIRULCUUIUCIRILIRjLXjCXURILICIILCXXIUCIRILIR
4、jLXjCX(a) (a) U0=5V (b) I0=5A(b)+_U+_U答案答案: : (1) (a) U=67.08V (b) U=25V (2) (a) 25V, 0 (b) 0, 0, 25VRLCLCU UUUIR I XX？ZIU？IU、？ZUI Zui ？ZUI ？ZUI？ZUI？0II？222CLRUUUU？jLCUI RXX？22LCUI RXX0II？UUUCL1tan？RCL1tan？1tanLCXXR？RCLUUU 1tans( )40 2cos3000 Vu tt.us(t)i (t).1.5k1k1F61H3i (t).I.1.5k1kj1kLICISU-j2ks
5、eq1636.9 mAUIZ8 2 98.1 mACI1j225.355.3 mA(1j2)j1LCIIII U53.1I2222221210032516LLLLLR XRXRRXXRX5 0 AI 100 53.1 VU U.IRILIU53.1I553.1 A3j4AI 100 0j25j4LLUZI100 0 VU RILIU.IRILI2, CIUU.CIRILIRUCU22jA,2jj100100RLCRLLURRIIIIX 2222( 2)()100100RR100 2 0 V,j 2A,245 ALCRLRUIIII 2 0 VRUR2 0 ARIeqjjjLCLCRXUZXRXIeqIm050050CCZXX jj50 245100 250 2j50 210045 VCRCUX IU j50j50CCUXIUCIRILICICUgCUgUgRLUUgg222A,100 2VLCRRLLLIIIUUX I145LRItgIcos100VRUU
