Form 3 PMR Science Chapter 7 Electricity

1. Chapter 7
Electricity
http://passmyexams.co.uk/GCSE/physics/static_electricity.html

2. Water molecules are made up of

3. Structure of an atom
Subatomic
particles

4. What are found inside the atoms?

5. Most objects are charged

6. Door knob carry negative charges

9. Like charges R E P E L

10. Unlike charges A T T R A C T

11. Electrostatics
• Study of Electrical charges
• Where can we find electrical charges?
• How is it produced?
• Produced when 2 insulators rubbed against
each other
• +ve and –ve

12. When the materials are rubbed
against each other
Positively charged Negatively charged
Polythene Wool
Wool Cellulose acetate
Ebonite Animal fur
Silk Glass
Amber Animal fur
Why??

13. Experiment One

14. Electron transfer

15. Different materials
Different tendency to gain electrons

16. Experiment 2 – Electroscope

18. Why?
• Electrons move!!

19. Movement of electrons

20. Experiment 3 - Induction
http://www.physicsclassroom.com/mmedia/
estatics/esn.cfm

21. Negative charges repel
More divergence

22. Touching an electroscope

23. When the negatively charged rod
is removed

24. Electrostatics in your daily lives

26. The metal surface also carries
static charges

27. Petroleum oil tanker