VAN DE GRAFF Generator

1
VAN DE GRAFF Generator

• By Gary Zhong

2
What is an ATOM?
3
What is an atom made of?

• 1. Protons positive charge
• 2. Electrons negative charge
• 3. Neutrons no charge

4
Bohr Model
5
Like charges repel, Opposite charges attract
6

• Insulators
• Conductors

7
Static Electricity

• Visible attraction
• Repulsion
• Electrical sparks

8
TRIBOELECTRIC SERIES

• Hand
• Glass
• Hair
• Nylon
• Wool
• Fur
• Silk
• Paper
• Cotton
• Hard rubber
• Polyester
• Polyvinylchloride plastic

9
Glass rod and Silk cloth demo
10

• This charge
• imbalance
• is the origin of
• Static Electricity

11
Hair and comb demo

• Combing your hair moves electrons from your hair
  to the comb
• The comb will now have an electric static charge

12
Coulombs Law
13
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

14
Main apparatus

1. Motor
2. Upper and lower roller
3. Belt
4. Upper and lower brush
5. Metal sphere

15
How it works!
16
(No Transcript)
17

• As the belt keeps running, more charges are
  deposited on both pulleys

18
Zoom in on our hair
19
Hair raising demo
20
Electric spark demo
21
Factors that affect spark production

1. Materials involved
2. Surface area connecting the materials
3. Humidity

22
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

23
(No Transcript)
24
Thank You