STATIC

ELECTRICITY

WHAT IS STATIC ELECTRICITY?

You walk across the rug, and reach for a

doornob…ZAP! You get a shock

Come inside from the cold pull off your

hat…BOING! All your hair stands on end.

Why does this only happen in the winter?

STATIC

ELECTRICITY

THE ATOM: REVIEW

An atom is made up of protons (+), neutrons (0), and

electrons (-)

A neutral atom has an equal number of

____________ and _____________

An atom that has lost or gained electrons is called

an

Remember: only ELECTRONS can be gained or lost

PROTONS ELECTRONS

ION

NEUTRAL OBJECTS & CHARGED OBJECTS

A neutral object does not have any charge.

This means that the number of

_____________ are equal to the number of

______________

A charged object has a different amount of

___________ compared to ___________

PROTONS

ELECTRONS

ELECTRONS PROTONS

LAW OF ELECTRIC CHARGE

The law of electric charge states:

Objects that have like charges repel each other

Objects that have opposite charges attract each

other

LAW OF ELECTRIC CHARGE

This means that:

Object 1 Object 2 Attract or Repel?

Positive Positive

Negative Negative

Positive Negative

Charged Neutral

REAL WORLD USE

Electrostatic Paint Sprayers

Paint given charge as leaves

nozzle

Object given opposite charge

Particles attract

Minimizes waste

Useful for curved objects

Check it out…

HOW IS STATIC ELECTRICITY CREATED?

1 - Friction

Rubbing 2 different substances together, the

substances can be given an electric charge

One substance loses electrons, the other gains

The substance that loses the electrons will have

a _______________ charge and the substance

that gains electrons will have a _____________

charge.

Check it Out

POSITIVE

NEGATIVE

HOW IS STATIC ELECTRICITY CREATED?

Some substances have a strong hold on

electrons and others have a weaker hold

Substances with a weak hold will _________

electrons

Substances with a strong hold will _________

electrons

LOSE

GAIN

ELECTROSTATIC SERIES

Determines the kind of

electric charge produced

on each substance when

2 substances listed are

rubbed together

WHAT WILL HAPPEN?

If glass is rubbed with

polyester, the glass will

become ___________

and the plastic will

become ___________

If ebonite is rubbed with

fur. Ebonite becomes ___

Fur becomes ________

POSITIVE

NEGATIVE

POSITIVE NEGATIVE

HOW IS STATIC ELECTRICITY CREATED?

2 – Conduction

Two objects with different amounts of

charge come in contact

___________ move from one object to

another

ELECTRONS

Charged

Neutral

HOW IS STATIC ELECTRICITY CREATED?

Electrons always move from object with

larger negative charge to objects with

smaller negative charge.

Both objects will have same type and

amount of charge

EXAMPLES OF CONDUCTION

Before Contact

+ + + + + + - - + - - + - - +

Before Contact

After Contact After Contact

HOW IS STATIC ELECTRICITY CREATED?

3 – Grounding

Objects with an excessive electric charge (+

or -) can have it removed by grounding

Transfer of electrons between object and

large neutral object (ex. Earth).

Electrons move to charged object

How can it end up with a charge?

Watch This

REAL LIFE USES OF CHARGED OBJECTS

PHOTOCOPIER

LASER PRINTER

ELECTROSTATIC PRECIPITATORS

(FILTER)

FIGHTING STATIC CLING