EVALUATION AND REVIEW QUESTIONS: 1. (a) Prove that Kirchhoff's voltage law is valid for the circuit in Figure 11-1. Do this by substituting the measured algebraic sums from Table 11-2 into a loop equation written around the outside loop of the circuit. (b) Prove Kirchhoff's current law is valid for the circuit of Figure 11-1 by writing an equation showing the currents entering a junction is equal to the currents leaving the junction. Keep the assigned direction of current from step 5 and use the signed currents computed in step 10. If an algebraic sum in Table 11-2 is negative, what does this indicate? 3. What is the effect on the final result if you had been directed to record all currents in step 5 as negative currents instead of positive currents? 4. In your own words, list the steps required to apply the superposition theorem. 5. Use the superposition theorem to find the current in R, in Figure 11-6. R₁ w 10012 R, 2002 6. -20 V H R₁ 300 g +40 V Figure 11-6 www When the superposition theorem is applied to a circuit containing a current source, the current source is replaced by an open circuit when solving for the other sources. Why? 113