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Electricity and Magnetism Y8
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Name at least one advantage of an electromagnet over a regular magnet
Any of these (other possible answers) adjustable strength, greater control over the magnetic field and durability
Which would need the strongest electromagnet? a) a bell b) an MRI scanner c) a loudspeaker
b) an MRI scanner
What happens to an electromagnet if you use more batteries?
it gets stronger
What type of core makes an electromagnet stronger?
iron
How can you change the direction of an electromagnet run on batteries?
turn the batteries around
What happens to an electromagnet if there are fewer turns on its coil?
it gets weaker
Electromagnets usually have a magnetic material in the centre of the coil called a __________.
core
What does this image show?
magnetic field lines
A force on a magnet or magnetic material is called....
magnetic field
In a magnet: north poles __________ south poles
attract
In a magnet: north poles __________ north poles
repel
Current in a circuit flows in which of the following directions listed below:a) In direction from high potential to low potential (b) In direction from low to high potential c) In direction of flow of electrons d) In any direction
In direction from high potential to low potential.
When a switch is opened in a circuit it is referred to as
incomplete (circuit)
The part of a circuit which can control whether electricity flows
switch
a material in which the electron does not flow freely or the atom of the material
insulator
an object or type of material that allows the flow of charge (electrical current) in one or more directions.
conductor
Potential difference divided by resistance equals
current
visual tool used to represent magnetic fields
magnetic field lines
a soft metal core made into a magnet by the passage of electric current through a coil surrounding it.
electromagnet
A compass contains a small ___________ which can spin
magnet
Do conductors or insulators have a higher resistance?
insulators
What shows how difficult it is for current to flow through a circuit
resistance
A voltmeter measures
potential difference
Which of the following would be the better insulator? Plastic, copper wire, graphite
plastic
When electricity flows it is called a __________________
current
Charge of electrons
negative
A container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power.
battery
Electricity that has several paths the current can take
parallel circuit
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