Electricity Notes - Middle School Physical Science

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Name: _________________________________________
Period: _____________
Electricity
Atoms and Electricity:
 All matter is made up of ___________________________
 Parts of the atom
 ________________________ - __________________________
 ________________________ - __________________________
 ________________________ - __________________________
 Where are the electrons in an atom?
 Move freely in the _________________ _______________
 Electrons can be added and removed from atoms
 When electrons are ___________________ to an atom, the charge of the atom
becomes ___________________________
 When electrons are _____________________ from an atoms, the charge of the
atoms becomes _______________________
 Atoms that are _______________________________________________________________
(not neutral) are called ___________________
Atomic Model
 “Cloud Model”
Atoms and Electricity
 Electricity is _________________________________________________________________________
 _______________________________ between particles that have the _____________________
 Like charges _________________ each other, opposite charges ________________ (think
about magnets!)
Conductivity
 Some materials allow electrons to move through them easily –
____________________________ - _________________
 Some materials do not –
______________________________ - ______________________________________________________
Electricity
 Objects can develop electric charges when their atoms
_________________________________________________________
 __________________________ - ___________________________________________________
 Van der Graaf generator
 ____________________________ - _________________________________________________
_______________________________________________________________________________
 Electrical wires – copper
 ______________________ - _______________________________________________________
 Balloon and paper
Static Electricity
 ______________________________________________________________________________________
 Once the charges build up, _________________________________________________________
 Static electricity is ___________________________ and can be ___________________________
 The loss of static electricity is called __________________ ____________________________
 Lightning
 “Shocking” someone when you touch them
Lightning
Current
 Charges (electrons) can flow through a __________________________
 An electric __________________ is a flow of charge
 _______________________________________________________________________________
 ___________________ is measured in ___________________________________________
 In order to have a current, there must be __________________________________________
 _______________________________________________________________________________
Flow of Electricity
 When using electricity you want a continuous flow of electrons through whatever
you are trying to power.
 If you have a source (usually from a wall outlet or battery), all you need is a
closed path or circuit through which electrons can flow
 The flow of electrons through the circuit is called the __________________
 In order to make the charges move and keep moving, you need a device that
uses energy to do the work required to move electrical charges
 __________________________
 __________________________
Batteries
 Batteries produce electricity by _____________________________________________________
Resistance
 The amount of current that can flow through a circuit depends on
 _______________________________________________________________________________
 How the wire resists the flow of electricity
 The opposition to the flow of electric charge is called _____________________________
 _________________________ is measured in _________________
 Anything that uses current creates resistance
Series Circuits
 ______________________________________________________________________________________
 ______________________________________________________________________________________
 ______________________________________________________________________________________
_____________________
_____________________
Parallel Circuits
 ______________________________________________________________________________________
 ______________________________________________________________________________________
 ______________________________________________________________________________________
______________________________________________________________________________________
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