Grade 9 Science Unit 3: Electricity Chapter 7: Static electricity is produced by electron transfer.

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Presentation transcript:

Grade 9 Science Unit 3: Electricity Chapter 7: Static electricity is produced by electron transfer.

Static Electricity Refers to electric charges that can be collected and held in one place. It is the temporary transfer of electrons.

Charges on objects… Remember : 1.Protons have a positive charge 2.Electrons have a negative charge

When the number of protons equals the number of electrons, the atom is neutral.

Neutral Atom

If electrons are removed from a neutral object, the object will become positively charged. If electrons are added to a neutral object, the object will become negatively charged.

Activity 7-1B Visualizing Charge Transfer Pg. 231

Page 2 of Booklet

Electric Discharge The removal of electric charge from an object. Ex. Lightening; “shocks”

Lightning occurs when static charges build up during a thunderstorm and are released into the ground in a process called “grounding”.

Electric Discharge

The Coulomb (C) The unit of electric charge. It takes the addition or removal of 6.25 x electrons to produce 1C of charge. ▫This is about the number of electrons that pass in to a 100W light bulb per second.

Laws of Electric Charges: 1.Like charges repel 2.Unlike charges attract 3.Charged objects attract some neutral ones.

Laws of Electric Charges

Technologies and Static Electricity Lightening rods

Photocopier

Electrostatic air cleaner