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- 1. Multiple Choice
What device is shown in the picture?
Generator
Motor
Transformer
Circuit
- 2. Multiple Choice
When domains line up, a magnet is created. What particles line up in domains and are responsible for magnetism?
atoms
protons
electrons
neutrons
- 3. Multiple Choice
Electromagnetic induction (using a magnetic field to produce a current) occurs in a coil when there is a change in the
electric field in the coil
magnetic field in the coil
voltage in the coil
- 4. Multiple ChoiceThis picture shows a turbine generator used to produce electricity at a geothermal power plant.
Electricity is produced by using steam to _____________.heat the turbine generatorsspin the turbine generatorsreduce friction in the turbine generatorsreduce emissions from the turbine generators - 5. Multiple Choice
How are electromagnets different from permanent magnets?
magnets can be turned on/off
you can turn an electromagnet on/off
magnets are more powerful
magnets have a North and South pole
- 6. Multiple Choice
What two forces are required for generators and electric motors to work?
magnetism and thermal
electricity and thermal
electricity and magnetism
magnetism and radiant
- 7. Multiple Choice
A device that transforms electrical energy to mechanical energy is a
generator
motor
transformer
magnet
- 8. Multiple Choice
A device that transforms mechanical energy to electrical energy is a
generator
motor
transformer
magnet
- 9. Multiple Choice
Which object(s) have magnetic fields?
Electric Charges
Magnets
Both Electric Charges & Magnets
Magnetic fields do not exist
- 10. Multiple Choice
Electric charges must ___ in order to create an observable magnetic field.
exist
be moving
be stationary
disappear
- 11. Multiple Choice
A(n) ___ electric current will create a changing magnetic field.
existing
direct
alternating
stable
- 12. Multiple Choice
The ___ coils a wire has the ___ current is able to be generated.
more; more
less; more
more; less
less; less
- 13. Multiple Choice
Can you produce current in a wire with a magnet that is sitting still?
Yes; having a magnet near a wire is enough to excite the electrons
No; the magnetic field has to be changing to excite the electrons
No; magnets cannot create electricity
None of the following
- 14. Multiple ChoiceWhat would happen if I move a bar magnet in and out of a coil of copper wire?Electric current would disappearThe magnet would explodeElectric current will flow through the wireIt would produce a gravitational field
- 15. Multiple ChoiceWhat would increase the strength of an electromagnet?Increasing the amount of current flowing through the wire.Inserting a wooden core inside the coilChanging the direction of the currentDecreasing the number of coils of wire
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