1. Agenda 1) Warm-Up 5 min 2) Vocab. 10 min 3) Video Qs 12 mins 4) Static fill-in Notes 15 min 5) Board Notes: Static Electricity 20 min 6) Demo(s) 5 min 7) Ch. 20 Study Guide 30 min 03-04-14 Charging by CONDUCTION

3. 1)Electrostatics: Electricity at rest; involves electric charges [+/- due to loss/gain of electrons] and the forces between them; static electricity. 2)Conductors: Electrons move easily; metals are very good conductors --electrons are “loose” and allow movement. 3)Insulators: Materials have tightly bound electrons & cannot wander so that they do not allow the movement of energy through them.

4. 4. Electric field: Space around every electrical charge; a kind of aura that extends through space; has both magnitude and direction; magnitude-- based on charge and direction is from positive to negative. 5. Charging by contact: When a charged object is placed in contact with a neutral object, charge will transfer to the neutral object. 6. Charging by induction: Bringing a charged object near a conducting surface; without physical contact, electrons will move in the conducting surface; charge has been induced. 7. Van der Graff Generator: Device for building up high voltages; charges are built up on the surface therefore a device for building up static electricity.

7. ELECTRICITY is EVERYWHERE Lightening Static electricity--when you “shock” someone by touching them. Atoms are held together in molecules—electrons will move to provide the “-” charge

8. Electrostatics Electricity(electric charges) at rest “…static's” means something is at rest

9. Static Electricity: I.Charging Bodies -Adding or removing electrons causes a charge and this charge stays on the “body” is called static electricity— electricity that does not move or builds up; can be removed by “grounding” the surface. -Materials can either lose or gain electrons: glass & silk will lose and carry a positive charge; rubber & wool will gain so carry a negative charge. -Metals are good conductors and so allow charges to move through them while insulators will keep charges on their surfaces or resist the flow of charges.

10. Charging by friction and Direct Contact -ex: static electricity after you rub your feet against the floor

11. Static electricity: charges which are found on the surface of objects An object is charged by adding or removing electrons Electrons move; NOT protons Electrons produce the charge which is negative; protons are positive charged

12. II. Electric Potential Energy -Objects which hold various amounts of charges will have a difference in the concentration of charges and so forces build up called electric potential energy. -Electrons will move from an area of high to area of low concentration through the use of a conductor; a “current” can be felt when charges move from and area of high to area of low. -Unit of electric charge is measured in the unit called: volt with distance in meters and force in Newton’s.

13. III. Electric Fields -Electrical forces can move without the use of a medium and move from a positive charge to a negative charge; lines of force can be felt or seen. -Law of Magnets can be used to explain electric fields. (likes repel and opposites attract) -Strength of magnetic field is perpendicular to the flow based on concentration of charges.

14. -Charging by different methods: Charging by conduction or direct contact: electrons move due to direct contact from area of high to low due to movement in conductors. Charging by Induction: charging of an object without direct contact. Charging by direct contact: allow the actual touching of charges to another surface to cause that surface to be charged.

15. Grounding: excess negative charges move to the earth OR excess charges move from the earth to an object ALL objects have static charges even if they are insulators or conductors

16. Potential energy difference depends on concentration of electrons -measured by volts -electrons will move from +  - -devices used to maintain concentration are called voltaic cells—batteries & generators

19. DUE TODAY: Static Electricity Notes (KEEP) Static Exploratory Lab (TURN-IN) DUE NEXT CLASS: Bring Calculator! “The voyage of discovery is not in seeking new landscapes but in having new eyes.” Marcel Proust