串并联电路中电流电压电阻电功率相互的关系

两个例子看看吧：串联：电流处处相等,电压分压。I1＝1A   I2＝1A   I＝1AI＝I1＝I2U1＝1V  U2＝2V  U＝3VU＝U1+ U2R1＝1Ω   R2＝2Ω   R＝3ΩR＝R1+ R2P1＝1W   P2＝2W  P＝3WP＝P1+ P2P1/ P2 = U1/ U2  = R1/ R2并联电流分流,电压相等。I1＝2A   I2＝1A   I＝3AI＝I1+I2U1＝6V  U2＝6V  U＝6VU＝U1=U2R1＝3Ω   R2＝6Ω   R＝2Ω1/ R = 1/ R1 +1/ R2P1＝12W  P2＝6W  P＝18W          P＝P1+ P2P1/ P2 = I1/ I2 = R2/ R1