Basic Circuit Analysis Parallel Circuits
Section 24 Power in Parallel Circuits Definition Kirchhoff's Current Law The algebraic sum of all currents entering and leaving a node in a circuit is equal to zero.  This figure shows current I_{1} entering a node, and currents I_{2} and I_{3} leaving it. If I_{2} = 2A and I_{3} = 1A, Kirchhoff's Current Law (and common sense) dictates that the current entering the node is 2A + 1A, or 3A.   Examples 1. Complete this current node:  +2 + 6 + I_{k} = 0 I_{k} = 6  Ans: 6A leaving 2. 25mA and 40mA are entering a 3branch node. What is the amount and direction of the third current? Ans: 65mA leaving the node. 3. Complete this current node:  +20 + 15  5 + Ik = 0 Ik = 30 Ans: 30ma leaving 
