KIRCHHOFF’S LAWS Basic DC TheorySubtract:8I120I224(8I12I26)18I218Now we have an equation with only I2, which is the current we are looking for.18I218I218181 ampereThis circuit could have been solved simply by using Ohm’s Law, but we used Kirchhoff’s Lawsto show the techniques used in solving complex circuits when Ohm’s Law cannot be used.SummaryThe important information in this chapter is summarized below.Kirchhoff’s Laws SummaryKirchhoff’s voltage law states that the sum of the voltage drops around aclosed loop is equal to the sum of the voltage sources of that loop.Kirchhoff’s current law states that the current arriving at any junction point ina circuit is equal to the current leaving that junction.Since voltage and current can be related to energy and charge, thenKirchhoff’s laws are only restating the laws governing energy and chargeconservation.ES-02 Page 48 Rev. 0
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