Static Electricity

1. Static Electricity

2. Charging Objects When two objects are rubbed together, how do we know which will become positive and which will become negative? Some atoms hold on to their electrons more tightly than others do.

3. Electrostatic Series • If a material is more apt to "capture" electrons when in contact with another material, it is more negative in the electrostatic series. • If a material is more apt to give up electrons when in contact with another material, it is more positive in the electrostatic series.

4. Electrostatic Series • When charging by friction occurs, the substance higher on the list loses electrons and the substance lower on the list gains electrons

5. Electrostatic Series E.g. Glass rubbed by silk causes a charge separation because they are several positions apart in the table. Glass will become positive and silk will become negative.

7. Why are neutral objects attracted to charged objects? • e.g. Balloon sticking to wall • Why does this happen? There are more NEGATIVE charges in the wall which are repelled fromthe negative balloon. Positive charges in the wall attract negative charges on the balloon.

8. Electrons move from fur to ebonite(electrostatic series) When Ebonite is rubbed with fur:

9. Three ways to charge an object • 1. Friction • 2 different neutral objects rubbed together. • One object loses electrons, the other gains.

10. Three ways to charge an object • 2. Contact • Two objects with different amounts of charge come in contact • Electrons move from one object to another until overall charges are equal

11. Three ways to charge an object • 3. Induction • An object having an electric charge produces the opposite charge in another object, without actually touching it