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# Electricity

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Discovery of Electricity
Early Discoveries
Particles of Matter
Electric Charge
Law of Conservation of Charge
Electric Force
Electrostatic Law
Static Electricity
Charging by Friction
Charging by Contact
Charging by Induction

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### Electricity

1. 1. ELECTRICITY
2. 2. DISCOVERY OF ELECTRICITY  As early as 600 BC, the ancient already had a knowledge of electric charge. They knew that amber, a yellowish mineral, when rubbed against fur, exhibits a peculiar property that enables it to attract small pieces of materials such as feathers.  In 19th century, William Gilbert, observed that other materials exhibit a similar property. He found out that glass, when rubbed against silk, attracts small lightweight pieces of materials.
3. 3. EARLY DISCOVERIES  That electricity can flow through a substance was discovered by the 17th century Otto Von Guericke and Stephen Gray.  During the mid-1700s, Benjamin Franklin theorized that electricity is na kind of fluid that flows from one object to another. He even speculated that lightning is a form of electricity.
4. 4. PARTICLES OF MATTER e - e - e - e - P + P + n ± n ± n ± P + P +
5. 5. ELECTRIC CHARGE -It is a property that causes subatomic particles such as protons and electrons to attract or repel to each other. Electric Charges move in a flash through a lightning bolt. TWO TYPES OF ELECTRIC CHARGE 1. Positively charged -lost some electrons 2. Negatively charged - Gained electrons *AN EXCESS OR SHORTAGE OF ELECTRONS PRODUCES A NET ELECTRIC CHARGE. *CHARGE LOST = CHARGE GAINED
6. 6. LAW OF CONSERVATION OF CHARGE “ Charges cannot be created nor destroyed, but can be transferred from one material to another. The total charge in a system must remain.”
7. 7. ELECTRIC FORCE -force that acts on charge or the force of attraction or repulsion between electrically charged objects. -depends on charge and distance. A. B. C. + - +2 - + +
8. 8. ELECTROSTATIC LAW “LIKE CHARGES REPEL AND UNLIKE CHARGES ATTRACT.”
9. 9. STATIC ELECTRICITY AND CHARGING STATIC ELECTRICITY is the study of the behavior of electric charges, including how charge is transferred between objects. Charge can be transferred by: 1.Friction 2.Contact 3.Induction
10. 10. CHARGING BY FRICTION
11. 11. CHARGING BY CONTACT
12. 12. CHARGING BY INDUCTION
13. 13. 1.What will happen when two like charges are brought together? 2.How do you describe the usual way by which a material can gain a positive charge? 3.If you comb your hair and the comb becomes positively charged, what will happen to your hair. 4.Which can be attracted by a positively charged object?