static electricity. energy energy:the ability to do work. energy cannot be created or destroyed. it...

10
Static Electricity

Upload: shana-newman

Post on 13-Jan-2016

221 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Static Electricity

Page 2: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Energy Energy: the ability to do work. Energy

cannot be created or destroyed. It can only be transformed.

Forms of Energy: – heat– light– sound– mechanical– Electrical– hydraulic

Electricity: Is a form that energy may take. Static Electricity: Where a charge remains

stationary in an object.

Page 3: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Law of Electric Charges:Like charges repel each otherUnlike charges attract each other (opposites

attract)Charged objects will be attracted to neutral objects

Transfer of Charge:There are 3 ways charge can be transferred:

FrictionContactInduction

Page 4: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Charging by Friction

Charging by Friction: when electric charges are transferred by a rubbing action or friction.

Transfer of electric charges as you walk across a carpet, shows the movement of the electrons (which have the negative charge).

Page 5: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Electrostatic Series

Scientists have developed a list known as the Electrostatic series Chart to determine the kind of electric charge produced on each substance when any 2 substances are rubbed together.

Page 6: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Electrostatic Series ChartGlass WeakHuman hairNylonWoolFurSilkCottonRubberPolyesterFoamPolyethyleneEbonite Strong

Page 7: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Example:

If nylon socks and cotton shirts were dried together in a clothes dryer, which becomes positive and which becomes negative?

Nylon: positive, cotton: negativeThe difference attracts each other and

causes static cling!

Page 8: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Insulators and conductors

Insulators: a substance in which electrons cannot move freely from atom to atom:

ex. Fur, silk, wood, rubber, glass, plastic

Conductors: a substance in ehich electons can move freely from one atom to another.

ex. Silver, copper, magnesium, iron.

Page 9: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Grounding

Discharge to remove any electric charges on an object.

Can be done by connecting these objects to the earth (which is a good conductor)

Objects are then groundedThe earth is so large that it removes all the charge.Only the electrons can move.

Page 10: Static Electricity. Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat –

Questions:

P.406 # 1-4P. 407 # 5, 7, 8.P.410 # 2-6.