简明电路基础课件PPT课件

1、 名名 称称名名 称称 符符 号号单单 位位单单 位位 符符 号号 1 1b1 f tF1 1b UIPPI 2RPRU 2 IUtQUtWPuidtqqwtwpdddddRURUUUIP2 P = I 2 R , RPI2 RPI RUP2PRU2PRU A25210.RPI P = I U = (2A)(3V) = 6 W P =I（- U） = (2A)(- 3V) = - 6 W I = 2 A+-U = 3 VI = 2 A+-U = 3 VEI = 2 Acaacb+U 1-U 2+-R1R2 Id da ab bc cE1= 20 VR1R2E2= 10 VU2= 10 VU1=

2、 10 VU3= 10 VR3 U = 0 ： U1 + U2 +U3 E1 E2 = 0 (10 +10 + 10 -10 20) V = 0 U = E： U1 + U2 + U3 = E1 + E2 (10 +10 + 10 )V = (10 + 20) V 30V = 30V3 VVVVV3 V3 V9 V333 E = 20 VR2 = 20R1 = 10R3 = ?R4 = 100I = 100 mA R3 = IU3 U = 0 : U1+ U2 + U3 + U4 - E = 0 U1 = I R1 = (0.1A) (10 ) = 1 VU2 = I R2 = (0.1A)

3、(20 ) = 2 VU4 = I R4 = (0.1A) (100 ) = 10 V U3 = E U1 U2 U4 = 20V 1V - 2V - 10V = 7 V R3 = U3 / I = 7 V / 0.1A = 70 E 2 = 10VRaIU = 1 VUabb+- U = 0， U1 + Uab + U4 E = 0 Uab = E U1 U4 = 10V 3V 2V = 5V U2 + U3 Uab = 0 Uab = U2 + U3 = 4 V+ 1V = 5V E = 10 V+U13 VU2U3U44 V2 V1 V-+-+-+-a ab bABCD123ABCI1a

4、2 mAI3I4I5I2I63 mA5 mA2.5 mA4 mA3.5 mAI14 AI3I2ABC3 A1 A5 A4 A2 A I1 + 4A = I2 + 3AI2 = ？ I2 + 3A = 4 A + I3 + 2A I3 = ？ I3 + 4A = 5 A + 1 A, I3 = 2A I2 + 3 A = 4A + 2A + 2A, I2 = 5A I1 + 4A = 5A + 3A , 所以所以 I1 = 4AE3 mAAA2 mA5 mAAI1I2I3 I1I2AabAI1 = 5AI7 = ?I2 = 6AI6 = 1AI5 = 4AI3I4BCD USabUSIRLU+-0I ortUUSUSabUSabIRLU+-0Ior tUUSRSSSIRURRSUSUSIRLaRS6V 0.01RL5RS5bab6V50USUSI = 0aRSRLRSbabI+-UabUab+-USR