Electricity

What is Electricity?

• Electricity is everywhere:

HousesCarsBatteriesClouds

Parts of an atom

• What parts make up all atoms?

Electricity and Charge

• Electricity is what happens when you get MORE electrons floating around in one spot than protons.

ElectronsProtons

Moving Electrons

• Protons are stuck!They can’t leave an atom.

• Electrons can go around wherever they want…They don’t HAVE to stay suck next to a proton

Where Electrons Stay

• Electrons PREFER to say close to a proton…

• 1 proton & 1 electron, together: happy pair but NO ELECTRICITY!

Moving Electrons

• When we move electrons away from their protons, then we get ___________________.

Electrons Atoms

Static Electricity

• If we just save electrons in the bucket, and let them sit there, that’s what we call ____________________________________.

Electrons

Static Electricity

• Electrons in a bucket aren’t very happy, they want to get out and go back to their protons.

• When they are trying to “Break Out”, that’s when we see the evidence of Static Electricity

Charges• What happens to an object when you start

pulling out electrons.• What kind of CHARGE does each bucket have?

Electrons Atoms

Charges

• What kind of charge did the Atom bucket have before we started taking electrons away?

Atoms

Charge Interaction

• Begin with two buckets of atoms.

Atoms 1

Atoms 2

Charge Interaction

• Put all the electrons in Bucket #1, and all the protons in Bucket #2.

Atoms 1

Atoms 2

Charge Interaction

• What charge does each bucket have?

Electrons 1

Protons 2

Charge Interaction

• Will there be any force between the buckets?• Opposite charges_______________________.

Electrons 1

Protons 2

Charge Interaction

• If you get rid of the bucket of protons and bring in a second bucket of electrons?

• Like charges _____________________________.

Electrons 1

Electrons 3

Electron Philosophy

• BUT, how does one go about obtaining a bucket of electrons in the first place?

Friction

• Rubbing two objects together is one way to transfer excess electrons to one of them.

• Here, the balloon becomes the “bucket” and gets the extra electrons.

Friction

• Once the balloon has a negative charge, it will stick to the wall. Why?

-

Local Charge

• The negative balloon pushes all the electrons in the wall far away from it. All that is left are the protonsthat can’tmove. -

Charge by Induction

• Now the left side of the wall has a positive charge and the right side has a negative charge. Thisis called acharge byinduction.

- - - - -

+ + + +

Charge by Induction

• When the balloon is removed, the charge in the wall will go away, and every electron will match next toa proton again. +- +-

+- +-

Charge by Conduction

• If a negatively charged object comes in contact with another object, charge can be transferred by ___________________________.

• You rub your feet on a carpet and become the electron “bucket”, then touch a door handle.

• The door handle gets some of your extra electrons, and some of your charge.

Gallery Walk

• Begin the Gallery Walk on Static Electricity after receiving the instructions.