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1、Kirchhoffs Current LawKirchhoffs Current Law：KCLsome common circuit terms:branch:3126745nodebranchEach two-terminal component or the series-parallel connection of components constitutes a branch.series?parallel?node:point of connection between two or more branchesKCL:The algebraic sum of currents en
2、tering a node(or a closed boundary)is zero.()0i t=Mathematically,KCL implies thatKCL is an important method to calculate the value of current.1i4i2i3i12340iiii+=12340iiii+=1423iiii+=+Practice problem：Find the unknown current shown in this figure.Solution:1i7A4A10A2i12Aselect the current leaving the
3、node as positivenode：1+47=0i13Ai=node：2112+10=0ii（）21Ai=Practice problem：The power of 4V voltage source is _W.A 0B 1Answer：A1S1U4V22AC 2D 4closed boundary1i2i3i1N2N1230iii+=1i2i1N2N12ii=i1N2N0i=when KCL is applied,it is only related to the connection relationship of the branch without considering the nature of the components on the branch.KCL:one of the topological constraints