Chapter 9. Resistors

Sandwich, the line-following robot, uses many resistors on its circuit board (see Figure 9-1). These resistors are so vital that Sandwich could not operate without them. In this chapter, you'll learn how to identify, purchase, and test resistors. In later chapters, you'll put resistors into use in the same way that they're used on Sandwich.

Five resistors on Sandwich's circuit board

Figure 9.1. Five resistors on Sandwich's circuit board

Limiting Power with Resistors

The main water supply hookup to your home is a fairly large pipe. But the pipe leading to your showerhead is a lot smaller.

Obviously, the smaller pipe saves some space, but it also acts to decrease the amount ...

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