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1、d15 abc6 6 205 7 d(a)15 abc6 6 205 7(b)d15 abc3 4 7(c)d图2.7 例2.4图d15 abc6 6 205 7 d(a)15 abc6 6 205 7(b)d15 abc3 4 7(c)d图2.7 例2.4图d15 abc6 6 205 7 d(a)15 abc6 6 205 7(b)d15 abc3 4 7(c)d图2.7 例2.4图I11I12R12I232I2R31I3I31R23(a)I33R332R2R11I1(b)I2312312233133123121223231231231121RRRRRRRRRRRRRRRRRR213132
2、133221311323211332212332121313322112RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR上一页下一页返 回0321iii在任何时刻在任何时刻,流入流入一个节点电流之和等于一个节点电流之和等于流出流出该节点电流该节点电流之和。之和。657892134gi3i4bi5ci2fdei6Sai1图图 电路实例电路实例126iii01mkku0gacgbcabuuuu0gacgacuuu657892134gi3i4bi5ci2fdei6Sai1gcaggacgacuuuuu0gacgacuuu图图2.32 2.32 基尔霍夫电流定律基尔霍夫电
3、流定律应用于闭合面应用于闭合面上一页下一页返 回上一页下一页返 回图图2.33 晶体管电流流向图晶体管电流流向图上一页下一页返 回上一页下一页返 回图图2.34 两个电气系统联接图两个电气系统联接图上一页下一页返 回上一页下一页返 回上一页下一页返 回上一页下一页返 回图图2.36 基尔霍夫电压定律的推广应用基尔霍夫电压定律的推广应用上一页下一页返 回上一页下一页返 回 A124104RRUEI2111上一页下一页返 回上一页下一页返 回AB U1+-R1U2+-R2 U3-+R3US+-I上一页下一页返 回A+-B 5V-+I10A+-B 10V-+-2A5U10V图图2.382.38 例例
4、7 7的电路图的电路图上一页下一页返 回上一页下一页返 回U1I1U2abR1R2I2RL图2.6 例2.3图755050505050221LLabRRRRRR滑线变阻器R1段流过的电流ARUIab93.27522011负载电阻流过的电流可由电流分配公式（2.5）求得，即VIRUAIRRRILL5.7347.15047.193.2505050221222VUAIAIRab1204.2504.24507575455220555075507525221因I1=4A,大于滑线变阻器额定电流3A,R1段电阻有被烧坏的危险。R1I1R5I5I2R2acdR4R3I3I4bR0Us(a)aIIRaoR0U
5、sRcRdR4R2bcI4I2(b)d图2.10例2.5图R1I1R5I5I2R2acdR4R3I3I4bR0Us(a)aIIRaoR0UsRcRdR4R2bcI4I2(b)d图2.10例2.5图5405010501044050101040204050104050135351355113513RRRRRRRRRRRRRRRRRRdcaR1I1R5I5I2R2acdR4R3I3I4bR0Us(a)aIIRaoR0UsRcRdR4R2bcI4I2(b)d图2.10例2.5图24604060400bRRa与Rob串联,a、b间的等效电阻442420abR桥式电阻的端口电流ARRUIabs544122
6、50AIRRRIAIRRRIdccdcd156040403560406042244242为了求得R1、R3、R5的电流,从图2.10(b)求得VIRIRUcaac112345202ARUIac8.24011211并由KCL得AIIIAIII2.022.22.28.2543513图图 电压源和电阻串联组合电压源和电阻串联组合其外特性方程为IRUUs0/0RUIIs其外特性为图 电流源和电阻并联组合00RUIIRUSSSS或00RR+-abUS1+US2US1US2+-+-ab+-abUS1-US2+-+abUS1US2+-abUS1=US2US1US2+-+-abIS1IS2ababIS1=IS2IS1IS2ababIS1+IS2IS1IS2ababIS1-IS2+-abUS1US1+-abAabIS1IS1abA10A10Vab+-515440A25Vab+-4ab10A50V+-24+-
例求图示电路中ab两点间的等效电阻Rab
