1. Electric Charge and Force
Chapter
Electric Charge and Force

2. Bill Nye clip on electricty

3. Electricity! What is it?
Telephone – microphone changes sound waves into electric currents

4. Electricity
Light shinning into a room

5. Electricity Step on a pin – electrical pulses to and from the brain
Electric fence video – Youtube Brainiac

6. Electric Charge
Electric Charge – an electrical property of matter that creates electric and magnetic forces and interactions

7. Positive and Negative Charge
Protons: +
Neutrons: 0
Electrons: -

8. Transferring Charge
Walking on the carpet - electrons transferred from the carpet to your shoes
Shoes - excess of electrons; become negatively charged
Carpet - lost electrons; has an excess of positive charge

9. Charge
The difference in the number of protons and electrons determines the charge

10. Positive Charge
Fewer electrons than protons

11. Negative Charge
Fewer protons than electrons

12. SI Unit The SI unit for an electric charge is a coulomb or C.
Proton 1.6 x 10-19C
Electron -1.6 x 10-19C

13. Conductors and Insulators
Transfer of electrons
Material in which electrons are able to move easily – conductor
Metals

14. Insulators
Material in which electrons are not able to move easily – insulator
Plastics

15. Transfer of Electrons Objects are charged by a transfer of electrons
Protons and neutrons are fixed

16. Static Electricity
Accumulation of excess electric charge on an object (depends on material) - static electricity
Charging by friction

17. Static Electricity

20. Lightning Large static discharge
Static discharge between cloud and ground

23. Thunder Lightning - generates powerful sound waves
Heat - causes air to expand rapidly, producing sound waves

24. Lightning Facts
com/info/interesting- facts-about-lightning/

25. Charged by Contact
When a negative charged object touches a neutral object
Electrons will transfer
Transfer give a negative charge

26. Charges move within uncharged objects
Negative charged object touches a neutral object
Electrons move to the back of the object
Induced charge

27. Conservation of Charge
Law of Conservation of Charge - charge can be transferred from object to object, but it cannot be created or destroyed

28. Polarization Comb and paper
Electrons in paper cannot move freely – insulator
Charged comb moves molecules in paper – induces charge
One side is slightly more positive or negative

29. Opposite charges attract
Charges Exert Forces
Unlike charges attract
Like charges repel
Depends on distance apart
Opposite charges attract
Like charges repel

30. Electric Fields Electric Field - surrounds every electric charge
Exerts the force that causes other electric charges to be attracted or repelled

32. Electric Fields
Any charge that is placed in an electric field will be pushed or pulled by the field

33. Electric Force
Electric Force – force of attraction or repulsion between objects due to charge