electricity. recall electron: negatively charged fundamental particle proton: positively charged...
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ElectricityElectricity
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RecallRecall
ElectronElectron: negatively charged : negatively charged fundamental particlefundamental particle
ProtonProton: positively charged : positively charged fundamental particlefundamental particle
Static electricityStatic electricity: build up of charge: build up of charge
ElectricityElectricity: flow of electrons: flow of electrons
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Electrons and the GreeksElectrons and the GreeksThe ancient Greeks noticed that The ancient Greeks noticed that rubbing amber could cause it to rubbing amber could cause it to attract bits of straw attract bits of straw
The name we use for this type of The name we use for this type of attraction, attraction, electricityelectricity, comes from , comes from the Greek word for amber, the Greek word for amber, electronelectron
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Key concepts about chargeKey concepts about chargeThere are two electrical charges:There are two electrical charges:
– –and+and+
Electrons have a - charge and are free Electrons have a - charge and are free to move in and between certain types of to move in and between certain types of materialsmaterials
Protons have a + charge and cannot Protons have a + charge and cannot movemove
The The flow of electronsflow of electrons is called electricity is called electricity
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Most objects are Most objects are neutralneutral, because , because they have an equal number of + they have an equal number of + and – charges/electronsand – charges/electrons
When 2 neutral objects are When 2 neutral objects are rubbed together they each get an rubbed together they each get an opposite chargeopposite charge
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The Law of Electric ChargesThe Law of Electric Charges says says that opposite charges attract, like that opposite charges attract, like charges repelcharges repel
+ and – charged objects also + and – charged objects also attract most neutral objectsattract most neutral objects
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Attract: cling togetherAttract: cling together
Repel: push apartRepel: push apart
Amber: yellow-orange Amber: yellow-orange
fossilized tree resin -fossilized tree resin -
often containing insectsoften containing insects
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?
•What is the charge on the mystery box?
Attraction
•The object could be neutral or positive
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?
•What is the charge on the mystery box?
Attraction
•The object could be neutral or negative
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?Repulsion
•What is the charge on the mystery box?•It MUST be positive
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?Repulsion
•What is the charge on the mystery box?•It MUST be negative
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+++
What is the charge on the pith ball?
What happens when webring a charged rod near?
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ElectroscopesElectroscopes
A device that can detect the charge on an A device that can detect the charge on an objectobject
Examples: Metal Leaf ElectroscopeExamples: Metal Leaf Electroscope
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Your TurnYour Turn
Read and make a small note on Read and make a small note on – page 470 on page 470 on Electrostatic Paint SprayersElectrostatic Paint Sprayers
Page 471 Page 471 – Q: 4-7 Q: 4-7