125 Basic Circuits Unit 2 8 Series Circuits 9 Parallel Circuits 10 Combination Circuits T he chapters in this unit provide a thorough understanding of electrical circuitry. Chapter 8 explains the principles of series circuits. You will take complex series circuits and reduce them into simple, solvable circuits. Chapter 9 explains several diff erent methods for reducing and solving parallel circuits. Th e fi nal chapter in this unit covers combination circuits, taking you step-by-step through a number of examples. When you have fi nished this chapter, you will be able to reduce any series-parallel circuit into a simple series or parallel circuit. In all three chapters, typical circuits are presented with illustrations of proper troubleshooting techniques. Th ese illustrations show how to use meters to locate open and short circuits. Th ese sections should prove valuable for lab work and will assist you in comprehension.