1. Charging By Conduction and Induction

2. Two ways to move electrons
Conduction: electrons are transferred by direct contact.
Induction: electrons on an object are rearranged without physical contact.

3. Two types of materials
Conductors: a material through which electric charges move easily.
Metals are good conductors
Insulators: a material through which electric charges can’t move easily.
Plastics, rubber, ceramics, wood

4. Electroscope
Flask
Metal bar (conductor) through rubber stopper (insulator)
Two pieces of thin foil on the bottom
Charge on the metal will push the foil apart
because they have the same charge

5. Electroscope
No Charge- leaves hang straight down

6. Induction
Rod with negative charge

7. Induction Rod with negative charge
Pushes electrons in electroscope down

8. Induction Rod with negative charge
Pushes electrons in electroscope down
Extra negative charge

9. Induction Rod with negative charge
Pushes electrons in electroscope down
Extra negative charge
Leaves move apart

10. Induction
Remove rod everything returns

11. Conduction
Rod with negative charge

12. Conduction
Rod with negative charge

13. Conduction
Rod with negative charge
Transfers electrons

14. Conduction Rod with negative charge Transfers electrons
Extra negative charge

15. Conduction Rod with negative charge Transfers electrons
Extra negative charge Moves leaves apart.

16. Conduction
Remove rod leaves stay apart.

17. Grounding
Grounding means to connect a conductor, through some conducting material directly to the ground, or Earth.
Earth is so huge that it can accept or give up electrons without any significant change in its charge.
A lightning rod is an example of grounding charge