Magnets/electricity Flashcards
(38 cards)
What are magnets made up of?
Iron steel nickel and cobalt
Does every magnet have a magnetic field?
Yes
A flow of electrons thru metal causes a magnetic field
What are two things that happen with magnets are put together?
If put together the right way they connect (attract) which means north and south pole are put together
If they are put the wrong way which means north and north are put together or south and south then they repel
What can magnetism pass thru?
Gasses liquids and solids
Where does the most power come from the magnet?
The poles
Where is the magnet most weak?
Between its poles
Describe the concept of force of magnetism and distance
The farther away the magnets are, the weaker the force
What is electricity formed by?
By the flow of electrons (the negatively charged particles of atoms)
What are the two types of poles called on a magnet?
North pole
South pole
How do you measure the flow of electricity?
Amperes or amps
What is a current?
A steady flow of electricity
What are Circuits?
The unbroken paths that electrical currents often follow
What is a conductor?
A material that allows electrons to flow through it easily
What is an insulator?
Poor conductor of electricity
The force that pushes electrons thru a circuit is measured in?
Volts
What is a complete circuit?
A series of wires and/or electrical devices that form a closed path for electricity to flow through
For a circuit to work it needs….
An electrical energy source-a cell
What is a cell?
A single unit containing electrodes and electrolytes to produce energy
What is a battery?
2 or more cells joined together-they change chemical energy into electricity
In order to produce electricity you need….
A source of electrons
A conducting path
A place for the electrons to go
What is a filament?
Connects 2 larger wires inside a light bulb
What causes the light bulb to glow?
When electrons move from one wire to another thru the filament. The friction then causes the filament to heat up and glow
What is electrical resistance?
Anything the hinders the flow of electricity
Resistance depends on….
Wire material Wire thickness, length Temperature of wire Type of circuit Number/type of electrical devices involved-bulbs,motors
