ELECTRICITY

What would life be like without electricity?

List 4 things that you would miss the most:           1) ______________________________           2) ______________________________           3) ______________________________           4) ______________________________           

Electricity: Electrical Current

Electricity

StaticStatic Is stationaryIs stationary

E.g. E.g. Brush your hairBrush your hair

Wool socks in Wool socks in tumble driertumble drier

CurrentCurrent Flows around circuitFlows around circuit

E.g. E.g. turn on lightturn on light

WalkmanWalkman

Electricity occurs in 2 different forms

Electrical Charge

Review:What is inside the atom?

The atom is made of 3 kinds of particles.The atom is made of 3 kinds of particles.

The electronThe electron

The protonThe proton

The neutronThe neutron

Electric fields surround every charge and can act upon other objects (even without touching them)

The force created by this field can either                                                attract          or           repel

Electric Charge

There are two types of charge: There are two types of charge: positivepositive and and negativenegative. .

Like charges Like charges repelrepel. . Unlike charges Unlike charges attractattract. . Charge is never created or destroyed.Charge is never created or destroyed.Charge is formed because a Charge is formed because a transfer transfer

of of electronselectrons. .

The Atom

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Neutral Object

Negatively Charged Object

Positively Charged Object

How Do They Become Charged?

ContactContact

Electrons getElectrons get

passed from onepassed from one

object to the otherobject to the other

when they touchwhen they touch

InductionInduction

Electrons in theElectrons in the

object move awayobject move away

or towards anotheror towards another

charged object ischarged object is

placed close to itplaced close to it

Friction

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What happens when you rub a balloon on your head and put it against the wall?

Static electricity occurs when electrons transfer to your clothes or hair and give them a charge.  When you touch something, the charge is released, causing a "jolt"

How do you think this machine affects the hair on these girls?

Static Electricity

How are static charges detected?

When Lightning Strikes!!!

Lightning

What causes lightning?

Lightning is actually Lightning is actually just just static electricitystatic electricity on a much larger on a much larger scale.scale.

The rubbing is The rubbing is caused by air caused by air moving aroundmoving around

In thunderclouds In thunderclouds bottom is usually bottom is usually negative and top is negative and top is positive.positive.

Uses of Static Electricity

Spraying a Car Positive Car

Negative Spraygun

The paint spreads out as each negative drop repels

No paint is wasted as the positive car attracts the negative paint

Removing Smoke from Power Station Chimneys

Positive Plate

Negative Plate

Charge up the Smoke

No smoke leaves the chimney

Earthing Petrol Tankers

Petrol rubbing against the pipe can build up a static charge which could cause an explosionThe tanker is joined to the ground with a wire to stop a charge building up

Insulators and Conductors

Insulators don’t Insulators don’t let electrons flow let electrons flow through themthrough them

Conductors let Conductors let electrons flow electrons flow through themthrough them

Electrons stay stuck on the surface and don’t move—That’s STATIC ELECTRICITY!