Two kinds of electricity
Electricity is a form of energy, and most of what a modern house runs on is built to work from it. It comes in two kinds, and this chapter is about the second.
Electric lamps, electric irons and electric fans are all devices made to be driven by electricity.
Static electricity
Electric charges that rest on the surface of an insulator without flowing. You met these in grades 7 and 9.
Current electricity
Electric charges that are flowing. This is what lights a lamp, and it is what the rest of the chapter is about.
The word "static" is the whole distinction
Static means standing still. The charges in static electricity are the same charges that make a current — the only difference is whether they are sitting on a surface or moving through something. Set them moving and static electricity becomes current electricity, which is exactly what the next few pages do.
One kind of charge, two situations
Do not read these as two different substances. There is one sort of electric charge in this chapter, and the two names describe what it happens to be doing.