Static Electricity S1-3-05 Investigate and explain electrostatic phenomena using the particle model of electricity. - Include: conservation of charge, conduction, grounding, attraction of a neutral insulator, induction. GLO: A2, D3, D4, E4

Review Static Electricity Material that gains electrons When a charge builds up on the surface of an object and does not move Material that gains electrons becomes negatively charged Material that loses electrons becomes positively charged

Conductors and Insulators Material where a charge is built up on the place it was rubbed Charges do not move freely on or through the material Conductor Material where a charge can move freely

Conductors and Insulators Good Conductors Fair Conductors Insulators Silver Silicon Amber Copper Carbon Cotton Gold Human Body Ebonite Aluminum Humid Air Fur Zinc Salt Water Glass Nickel Paper Brass Plastic Iron Porcelain Rubber Silk Wool Wood

Types of Charge Negative charge Positive Charge

Law of Electric Charges Two objects with a like charge will always repel one another Two objects of opposite charge will always attract each other What about neutral objects?

Law of Electric Charges If an object is charged it will ATTRACT Neutral objects Objects with opposite charge If an object is charged it will REPEL Objects with the same charge

Types of Charging Charging by friction Electric charges that are transferred by rubbing action Laundry tumbling around in a dryer Walking across a carpet Air rushing over a car or airplane Gasoline rushing out of a hose

Types of Charging Transferring charge by contact Occurs when one object is charged and the other is charged or neutral Extra electrons are transferred rapidly from one object to another

Grounding Discharged/ Neutralized Occurs when an object has all of it’s extra electrons removed Connecting the object to the earth

Grounding Grounding When a charged object is connected to the ground it shares it’s extra electrons with the Earth Damp soil is a good conductor and it can remove almost all excess charges

Types of Charging Charging by induction When a charge happens by indirect contact

Types of Charging Charging by induction

Types of Charging Charging by induction When one object that is negatively charged comes close to a neutral object, it pulls the positive particles to it

Types of Charging Charging by induction When the neutral object is grounded, the free electrons go into the ground, leaving positive particles behind EARTH

Types of Charging Charging by induction The second particle became charged without ever touching the negatively charged particle