Although Equation 2–2 is the formal definition of voltage, it is a bit
abstract. A more satisfying way to look at voltage is to view it as the force or
“push” that moves electrons around a circuit. This view is looked at in great
detail, starting in Chapter 4 where we consider Ohm’s law. For the moment,
however, we will stay with Equation 2–2, which is important because it provides
the theoretical foundation for many of the important circuit relationships
that you will soon encounter.