static electricity and electrical currants

Download Static electricity and electrical currants

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  • 1.April 29, 2013

2. 1. Define and describe static electricity2. Define and recognize the presence of a charge3. Distinguish between conductors andinsulators4. Describe how static electricity is different thancurrent electricity 3. Movement of charged particles 4. Rule 1: Like charges repel one anotherRule 2: Unlike charges attract one another 5. Electrons carry negative chargesand protons carry positivecharges Electrons can move from atom toatom An atom that has more electronsis negative An atom that has less electrons ispositive 6. The imbalance of positive and negativecharges So how do we move electrons from oneplace to another? By rubbing them together 7. The build up of electrons creates a staticcharge The jumping of electrons from one objectto another creates a static shock 8. When two objects are attracted the atomsdont move, only their charges The positive part of one object will beattracted and move toward the negativecharge of the other object The objects have become polarized. 9. TRIBOELECTRIC SERIES your handglassyour hairnylonwoolfursilkpapercottonhard rubberpolyesterpolyvinylchloride plastic Items near the bottom tend to gainnegative charges when rubbed withsomething near the top 10. Clouds become negatively charged relative tothe ground Lightning appear as charges are exchangedbetween the clouds and the ground 11. Agenda Bell Work Pick up Static ElectricityWS and complete Balloons andTravoltage Notes: Static vs.Currant Electricity Bill Nye: StaticElectricityHW: Chp 11pg 174-182RQs 1-16 12. Currents made of flowing electrons, in onedirection 13. Ampere (A) the rate of electrical flow Coulomb (C) unit of charge Relationship between charge and distance 1 C of charge (6.25 billion billion) per second So a wire that carries 5 A has 5 coulombs ofcharge per second 14. Electrons flow only when there is a differencein electrical pressure voltage Higher the pressure (V) stronger the flow Voltage = potential energy/charge Wires need a pump that provides the voltage tocause flow 15. Simple Circuit 16. Have loosely held electrons that travel veryeasily Most metals 17. Materials that do not allow electrons to travelfreely Plastic, cloth, glass and dry air