Moving & Using Static Charge
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Transcript of Moving & Using Static Charge
MOVING & USING STATIC CHARGE
Text 10.1-10.2: Page 400-411
Agenda
1. Review of Static Charge2. Moving Charge
Different Materials Contact Charge Induction Charge Grounding Electric Discharge
3. Electroscope Review Activity
Learning Goals
By the end of this class, we should be able to Compare and contrast insulators and
conductors Compare and contrast static, contact and
induction charge Complete an investigation to test types of
current charge and conductivity of materials
Reviewing Static Electricity
Materials
Materials can be grouped by weather they allow charge to move through them Insulators and Conductors
are groupings determined by their conductivity
Conductivity is the ability of materials to allow Martials to allow electrons to move freely in them.
Insulators
Material that hold onto their electrons and do not allow them to move easily are called electrical insulators
An insulator is a solid, liquid or gas that resists or blocks the movement of electrons EX: dry wood, glass and plastic
Conductors
Materials that allow electrons to change positions are called conductors Conduction is the
movement or transmission of electrons through a substance
Ex. Copper and aluminum
Somewhere in the Middle?
Some materials only allow some movement of electrons These are called fair
conductors Sort of like an insulator, sort
of like a conductor NOTE: only PURE water is
an insulator Most water has minerals in it
so it is considered a fair conductor
Let’s Test It – Conductivity Test Assemble the
electrical conductivity apparatus.
Test conductivity of different samples.
How Can You Test For Charge? You can use an
electroscope This is an instrument used
to detect electric charge Metal-Leaf electroscope
has a two very thin metal pieces called leaves suspended from a metal rod.
The metal rod is then attached to a top plate or metal knob
What Would Happen If? +
What Would Happen If? -
Contact Charge
This is an example of Contact Charge This can also be
called charge by contact
The charge is made through contact with another charged object
Induction Charge
This is very similar to contact charge Is the movement of
electrons between objects close by but not in direct contact
EX: you can statically – charge a balloon by rubbing it on your hair Put the balloon near a wall
and it will attract to it! No contact is made
Grounding
Grounding is the process of connecting a charged object to the earth’s surface This creates a path for
the electrons to travel to the ground
“Escape route” for electrons which removes charge
Electric Discharge
When electrons find an escape route and they transfer very quickly it is called electric discharge Sparks are an
example Sparks are a
transfer of charge by induction
Electric Discharge
Lightning is a very large example or electric discharge
Inquiry Question – Which way does a lightning bolt travel?
http://www.youtube.com/watch?v=l9kVA6aY5P8
Electroscope Lab
Using Static Charge
Pick a group of 2-3(max.) Choose a topic:
Lightning rods (p.g. 418) Static charge on vehicles (p.g. 419) Reducing static charge at home & work (p.g.
420) Spray Painting (p.g. 421) Photocopying (p.g. 422) Enviromental Applications (p.g. 423)
Summarize your findings using words & text Final Round = Static Charge Walk About