“So basically my couch has electricity and I use it to charge my battery powered doorbell”
“Okay that makes sense”
Now explain it to a Japanese samurai from the year 1218
"do you know how waterwheels grind up grain in a water mill using the force of running water? We found a way to create a huge source of force that runs all the time and can transfer its force over long distance. I can tell you in more detail, but that's the basics. Now that is a chime that has a mechanism that one can press instead of having to open the door to let you know that you are waiting to be let in. It requires the transferred force to make the mechanism work and that wire is how we transfer the force to the chime."