Before we can build Simple Bots, it is important to have a rudimentary understanding of how electricity works (or does not). Electricity comes in two forms, AC (alternating current), which is like the power that comes from a wall socket, and DC (direct current), which is like the power that comes from a battery. In the Simple Bots eBook, all of the electricity for bots will be coming from batteries. So, I will only be explaining DC (direct current) electricity in this Instructable.
When working with DC electricity, there are a few things to keep in mind, but two in particular which you shouldn't forget:
- DC power sources have both a positive ("plus") terminal and a ground terminal.
- In order for any circuit to work, electricity must be able to flow between positive and ground.