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Kirchhoff’s Current and Voltage Laws. KCL (Kirchhoff’s Current Law). The sum of the currents entering a node equals the sum of the currents exiting a node. Node. Application of KCL. I 1 = 2A. I 3 = 5A. I 2 = 3A. Problem w/KCL. I 1 = ?. I 3 = 250 mA. I 2 = 150 mA.
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KCL (Kirchhoff’s Current Law) The sum of the currents entering a node equals the sum of the currents exiting a node.
Application of KCL I1 = 2A I3 = 5A I2 = 3A
Problem w/KCL I1 = ? I3 = 250 mA I2 = 150 mA
KVL (Kirchhoff’s Voltage Law) The sum of the potential differences around a closed loop equals zero.
What KVL Really Means Sum of the Voltage drops across resistors equals the Supply Voltage in a Loop.