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Electricity and Magnetism

STUDY
PLAY
What is electricity?
matter with an electric charge
All matter is made up of
atoms
When electrons are separated from their atoms, the atoms become
charged
Insulators
hold electrons tightly
Examples of Insulators
Rubber, plastic, wood, glass, dry air
Conductors
allow electrons to flow
Examples of Conductors
metal and water
Like charges
repeal
Unlike charges
attract
Definition of Static Electricity
The imbalence of positive and negative charges
Characteristics of Static electricity
Results from the movement of electrons; affected by the material; after discharge does not flow; the shock is from the fast movement of electrons (causes warming of air)
Examples of Static Electricity
Slides, trampolines, lightening, clinging laundry, doorknob shock
Not an Example of Static Electricity
Electricity that flows in an outlet
Lightening is
a large discharge of static electricity
Lightening is caused by
friction of the movement of water droplets in a cloud build up areas of (+) and (-) charges
Lightening bolt occurs when
billions of electrons are transfered at the same rate
The heat from the bolt causes
the air around it to expand rapidly to produce compression waves (thunder)
What do lightening rods do?
they ground the charge
The lightening rod sends the charge to
the earth
Electroscope
a device you can use to determine the charge of an object as well as the magnitude of the charge
Current electricity is made by
generators (gathers electrons)
Current electricity forces electrons to move through a
conductor
Direct Current
electrons flow in the same direction all the time
Example of Direct Current
Flashlight
Alternating current
electrons flow changes directions
Example of Alternating Current
outlets in your home
Def. of circuit
the path taken by the electric current
Circuit needs to be two way or ------ circuits or it will not work
closed
Parts of a Circuit
Source of electricity, conductor (wire), load (resistor), switch (optional)
Series circuit
a single current flows through the path and all devices connected to the path
Example of Series Circuit
Flashlight
When more resistors are added to the series circuit the overall current with the circuit ----- (resistance ----)
decreases increases
Parallel Circuit
as the number of resistors increases the overall current stays the same
If one load of the parallel circuit goes out
the rest stay on
Amperes measures
electric current
Volts measures
amount of push a source of electricity gives
Watt measures
how much energy something uses
Ammeter
used to measure current
Magnetism
a property of some materials in which there is a force of repulsion or attraction between certain like and unlike poles
Magnets are attracted to
iron and metals the contain iron
Magnetic Field
a region around a magnet where magnetic forces act
When electricity flows through a wire it makes a ------- ---- around the wire
magnetic field
Electromagnet
a strong temporary magnet made by inserting an iron core into a wire coil and passing an electric current through the coil
The more wire around the iron the ----- the magnet
stronger

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