3. What do you know about electricity?

4. A Quick Review Protons are Positive Electrons are Negative

5. A Quick Review Protons and Neutrons are in the Nucleus of the atom. It can vibrate, but the nucleus stays in the centre of the atom.Protons and Neutrons are in the Nucleus of the atom. It can vibrate, but the nucleus stays in the centre of the atom. The Electrons surround the nucleus. They can move very easily.The Electrons surround the nucleus. They can move very easily.

6. A Quick Review If an electron is added to a neutral atom the charge becomes negative.If an electron is added to a neutral atom the charge becomes negative. An atom that has more electrons than protons has a negative charge.An atom that has more electrons than protons has a negative charge.

7. A Quick Review If an electron is removed from a neutral atom the charge becomes positive.If an electron is removed from a neutral atom the charge becomes positive. An atom that has more protons than electrons has a positive charge.An atom that has more protons than electrons has a positive charge.

8. Insulators and Conductors An Insulator is a substance that does not allow electrons to move to other atoms. Plastic and glass are good insulatorsAn Insulator is a substance that does not allow electrons to move to other atoms. Plastic and glass are good insulators A Conductor does let electrons move freely from atom to atom. Metals are good conductorsA Conductor does let electrons move freely from atom to atom. Metals are good conductors

9. Electric Charge Static ChargeStatic Charge -

10. Electric Charge Static Charge – (also known as Static Electricity) is what we call electric charges that build up and are held in one place.Static Charge – (also known as Static Electricity) is what we call electric charges that build up and are held in one place. E.g. – shuffle across the carpet and touch the doorknob. The spark that jumps from your finger to the doorknob releases the charge that has built up on you. E.g. – shuffle across the carpet and touch the doorknob. The spark that jumps from your finger to the doorknob releases the charge that has built up on you.

11. Law of Electric Charges There are two types of electric charge.There are two types of electric charge. – positive (+) – positive (+) – negative (-) – negative (-)

12. Law of Electric Charges The Law of electric Charges states:The Law of electric Charges states: “like charges repel and unlike charges “like charges repel and unlike charges attract.” attract.” Or, positive repels positive, And, negative repels negative But, positive attracts negative And, negative attracts positive

13. Law of Electric Charges

14. Updated Law of Electric Charges

15. 1.“Like” charges repel

16. Updated Law of Electric Charges 1.“Like” charges repel 2.Opposite charges attract

17. Updated Law of Electric Charges 1.“Like” charges repel 2.Opposite charges attract 3.Neutral objects are...

18. Updated Law of Electric Charges 1.“Like” charges repel 2.Opposite charges attract 3.Neutral objects are attracted to charged objects

19. Measuring Charge The unit that we use to measure electric charge is the Coulomb (C)The unit that we use to measure electric charge is the Coulomb (C) The charge on a single electronThe charge on a single electron is -1.6 x10 -19 C and the charge on a is -1.6 x10 -19 C and the charge on a single proton is +1.6 x10 -19 C single proton is +1.6 x10 -19 C It takes 6.25 x 10 18 electrons to make 1 C of chargeIt takes 6.25 x 10 18 electrons to make 1 C of charge

20. Electric Forces Charging by Conduction Charging by Conduction – occurs when objects touch and an electric charge is transferred from a charged object to a neutral one. When you get zapped by the doorknob, you are transferring the charge to the doorknob. – occurs when objects touch and an electric charge is transferred from a charged object to a neutral one. When you get zapped by the doorknob, you are transferring the charge to the doorknob.

21. Electric Forces Charging by Induction – is when objects are charged without touching or making any direct contact. No electrons have been transferred between objects, they’re just repositioned. Charging by Induction – is when objects are charged without touching or making any direct contact. No electrons have been transferred between objects, they’re just repositioned.

22. The End The End