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5th - Magnetism and Electricity

Terms in this set (34)

static electricity
When electrical charge builds up on an object when electrons jump from one thing to another it is called what? (note: Electrons do not flow, they jump to form static. Lightning is an example of static electricity.)
electron
negative charged particle of an atom
proton
positive charged particle of an atom
neutron
neutral charged particle of an atom
conductor
a material that allows electricity and heat to move easily and be pushed through it - Some examples of conductors are: copper (not too expensive to use for wiring)
electric charge
electric charges can be positive or negative; all the tiny particles that make up matter
electric field
this is the space around an electic charge, where the electric force acts
electric current
this is when electric charges are being pushed through a conductor
electric circuit
this is a closed path that carries electric current
series circuit
this is an electric path with only one option for current
parallel circuit
this is an electric path with two or more options for current
resistance
this is how much a material resists the passing of electric current
short circuit
this is the term for when electric current flows where it is not wanted
insulator
this is something that slows down the flow of heat and electricity
Why isn't silver used for wiring more often?
The Answer: Silver is too expensive.
Where is copper used frequently?
The Answer: copper is used for wiring, in TV and cell phone circuits
What are some examples of insulators?
The Answer: some insulators are: wood, clay, ceramic, plastic
electromagnet
This is the name given to a magnet that is made by wrapping wire around an iron bar, before running power through the wire.
How is the strength of an electromagnet affected by the number of times a wire is wound around it?
Answer: The more times the wire is wrapped around the magnet = the stronger the magnet becomes.
Which of the following items will a magnet attract: plastic comb, paperclip, or shoelace?
The paperclip will be attracted to a magnet.
Which of the following items will a magnet not attract: glass, screw, or nail?
The glass would not be attracted to a magnet.
The south end of a bar magnet is labeled as what?
South
The north end of a bar magnet is labeled what?
North
A bar magnet is strongest at what part?
The poles are strongest.
Is Earth like a huge magnet?
Yes
The north end of a bar magnet always points to what direction?
North
The south end of a bar magnet always points to what direction?
South
What does repel mean?
It means to push away.
What does attract mean?
It means to pull together.
Magnet poles that are alike will do what?
The will repel each other.
The type of current produced by a battery and flows in one direction is called what?
Direct Current
A machine that converts electricity into movement is called what?
Electric Motor
A machine that produces electricity from movement is called what?
Generator
The device used to increase or decrease electrical voltage is called what?
Transformer
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