Energy is a precious resource, that goes without saying. As such, we should be using energy efficiently and effectively. But what does efficiency really mean?
One way of defining efficiency is with respect to the amount of work that is done with a unit of energy. This definition is sufficiently close to what is used in physics to characterize the efficiency of heat engines. It also can be used to reason about the efficiency of a messaging protocol – which is precisely the exercise we’ll undergo in this presentation.