Static Electricity

1. Static Electricity • Static Electricity • abundance of positive or negative charge in an object

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5. StaticElectricity Where does the charge come from? The movement of electrons Loosely held electrons (valence electrons) are able to move between objects and within materials

6. Static Electricity Charging materials by friction Two materials can become electrically charged when they are rubbed against each other. + - Acetate rod - + Cloth + - + - + - + - Cloth gains negative charge = Negative Acetate loses negative charge = Positive - Home Back Next [S. Ball 2004]

7. Repel and Attract - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + + + + + + + + + Two materials which have the same chargewill repel each other. Two materials which have different chargeswillattracteach other.

8. - - - - - - - - - - CHARGING BY INDUCTION When a material which is charged comes near something which isn’t charged, it tends to induce a charge. This is because the electrons in the uncharged substance move away from the charged object. - + + - + - + - + + - - + + - - + - - + + - +

9. Conductors • Conductor • material that allows electrons to move through it easily • e- are loosely held • ex: metals like copper and silver

10. Insulators • Insulator • material that doesn’t allow electrons to move through it easily • e- are tightly held • ex: plastic, wood, rubber, glass

11. Static Electricity • Static Discharge • the movement of electrons to relieve a separation in charge

12. Static Electricity • Grounding • Provides a path for electrons to travel to relieve a difference in charge