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## Chapter 5. Primitive Logic Functions

### Switch Representations of AND and OR Functions

Before we leap into the fray, let’s first perform a couple of simple thought experiments involving switches and light bulbs. Consider an electrical circuit consisting of a power supply, a light, and two switches connected in series, one after the other [Figure. 5.1(a)].

##### Figure 5.1. Switch representation of a 2-input AND function.

The switches are the inputs to the circuit and the light is the output. A truth table provides a convenient way to represent the operation of the circuit [Figure. 5.1(b)]. As the light is only on when both the a and b switches are

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