DC CIRCUIT ANALYSISBasic DC TheoryThe first step is to draw an assumed direction of current flow (Figure 38). It does not matterwhether the direction is correct. If it is wrong, the resulting value for current will be negative.Second, mark the polarity of voltage across each component (Figure 39). It is necessary toFigure 38 Assumed Direction of Current Flowchoose a direction for current through the center leg, but it is not necessary to put in a newvariable. It is simply I2 - I1.Figure 39 Marking PolarityES-02 Page 50 Rev. 0
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