We just learned about Neutrons, Protons and Electrons.
How does the electricity from the plug in the wall go through the wires,
and to the lamps, TVs and toys we use every day?
You can't see it with your eyes, but scientist have studied and discovered that
there are three basic parts for most of the electricity that we see every day:
Voltage, current, and resistance.
We'll take time to learn about these one at a time,
starting with voltage which is sometimes called potential difference.
It can be confusing to try and imagine the way electricity works when it's zapping through a wire or a plug,
so we try to compare it to a pipe filled with water, since that's something easy to picture in our imagination.
If you have a big pipe filled with water, you can think of the voltage
as the speed of the water going through, or the speed that it is being pushed through the pipe.
(from: wikipedia - hydraulic analogy)
