They are a teaching aid for showing students how the various planets revolve and rotate. With an Earth/Moon/Sun system model you can answer all these questions by just turning the handle.. 1  Why we have day and night.  What a year is.
1. Static electricity is caused by the build up of electrical charges on the surface of objects, while current electricity is a phenomenon from the flow of electrons along a conductor. 2. When objects are rubbed, a loss and/or gain of electrons occurs, which results in the phenomenon of static electricity.
Static Electricity. How Static Electricity is Produced. When two different objects that are insulators (such as a plastic rod and silk cloth) are rubbed together, electrons move from one object to another. One object becomes negatively-charged, and the other object becomes positively-charged.