VAN DE GRAFF Generator

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VAN DE GRAFF Generator

• By Gary Zhong

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

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

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Bohr Model
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Like charges repel, Opposite charges attract
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• Insulators
• Conductors

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Static Electricity

• Visible attraction
• Repulsion
• Electrical sparks

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TRIBOELECTRIC SERIES

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

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Glass rod and Silk cloth demo
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• This charge
• imbalance
• is the origin of
• Static Electricity

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Hair and comb demo

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

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Coulombs Law
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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

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Main apparatus

• Motor
• Upper and lower roller
• Belt
• Upper and lower brush
• Metal sphere

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How it works!
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• As the belt keeps running, more charges are
  deposited on both pulleys

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Zoom in on our hair
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Hair raising demo
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Electric spark demo
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Factors that affect spark production

• Materials involved
• Surface area connecting the materials
• Humidity

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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

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Thank You