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.
How to Produce Static Electricity. Static electricity occurs when an electrical charge builds up due to friction between two different objects, usually items that are not good at conducting electricity. You've probably had static electricity in your clothes and hair when they were clingy. The following shows you a few ways to produce static electricity.