VAN DE GRAFF Generator By Gary Zhong
What is an ATOM?
What is an atom made of? 1. Protons: positive charge 2. Electrons: negative charge 3. Neutrons: no charge
Bohr Model
“Like charges repel, Opposite charges attract”
Insulators Conductors
Static Electricity Visible attraction Repulsion Electrical sparks
TRIBOELECTRIC SERIES Hand Glass Hair Nylon Wool Fur Silk Paper Cotton Hard rubber Polyester Polyvinylchloride plastic
Glass rod and Silk cloth demo
This charge imbalance is the origin of “Static Electricity”
Hair and comb demo Combing your hair moves electrons from your hair to the comb The comb will now have an electric static charge
Coulomb’s Law
What is a Van de Graff Generator? The basic fundamental principle behind this apparatus is separating opposite charges at both ends of the rubber belt
Main apparatus I. Motor II. Upper and lower roller III. Belt IV. Upper and lower brush V. Metal sphere
How it works!
As the belt keeps running, more charges are deposited on both pulleys
Zoom in on our hair
Hair raising demo
Electric spark demo
Factors that affect spark production 1) Materials involved 2) Surface area connecting the materials 3) Humidity
Has anyone felt a shock on dry winter days? Static electricity can build up in our bodies and cause a spark to jump from our bodies to pieces of metal or those in our surroundings
Thank You