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- 1. Multiple Choice
How could the output voltage of an electrical generator be increased?
by reducing the generator’s rotational speed
by reducing the mechanical work put into the generator
by increasing the resistance of the coils in the generator
by increasing the number of coils in the generator’s electromagnet
- 2. Multiple Choice
How does a step-down transformer alter the amount of voltage from a power line to a building?
It increases output voltage by increasing the number of wire turns in the secondary coil.
It decreases output voltage by decreasing the number of turns in the secondary coil.
It increases output voltage by decreasing the number of wire turns in the secondary coil.
It decreases output voltage by increasing the number of turns in the secondary coil
- 3. Multiple Choice
Two magnets are stuck end to end by a magnetic force. Which statement best describes these magnets?
The north poles of the magnets are attracted to each other.
The south poles of the magnets are attracted to each other.
The south pole of one magnet is repelled by the north pole of the other magnet.
The north pole of one magnet is attracted to the south pole of the other magnet.
- 4. Multiple Choice
Which action will have the least effect on the strength of an electromagnet?
changing the amount of current
changing the current’s direction
changing the number of wire loops
changing the size of the metal core
- 5. Multiple Choice
In cars with electric door locks, electromagnets allow the doors to be locked and unlocked at the push of a button. Why is an electromagnet used for this kind of door lock?
Using electromagnets conserves electricity
Using electromagnets prevents static electric shock.
Electromagnets can easily be turned off.
Electromagnets can attract metals or nonmetals.
- 6. Multiple Choice
Which statement best describes the magnetic orientation of the two magnets shown in the diagram above?
B and C are both north-seeking poles
B and C are both south-seeking poles
A and C are both north-seeking poles
A and C are both south-seeking poles.
- 7. Multiple Choice
What is the purpose of a transformer?
Change the voltage of alternating current
change the resistance of direct current
convert potential to kinetic energy
convert mechanical energy to electrical energy
- 8. Multiple Choice
If the north poles of two bar magnets are brought together, which is true?
The two north poles will repel each other.
The two north poles will attract each other.
No force will be experienced between the two magnets
One north pole will become a south pole due to the interactions
- 9. Multiple ChoiceA device that increases or decreases voltage in a power line is a ___.commutatorgeneratormotortransformer
- 10. Multiple ChoiceCurrent that does NOT reverse direction is called ___.alternatingdirect currentcircuit currentmagnetic current
- 11. Multiple ChoiceThe location of the strongest magnetic forces is the ___.electromagnetsmagnetic fieldsmagnetic domainsmagnetic poles
- 12. Multiple ChoiceCurrent that reverses direction in a regular pattern is called ___.alternating currentdirect currentcircuit currentmagnetic current
- 13. Multiple ChoiceThe region around a magnet where the magnetic forces act is the ___.electromagnetic polemagnetic fieldmagnetic domaintemporary magnets
- 14. Multiple ChoiceObjects that keep their magnetic properties for a long time are called ___.electromagnetspermanent magnetsmagnetic domainstemporary magnets
- 15. Multiple ChoiceA device that uses an electromagnet to measure electric current is a(n) ___.galvanometerelectric motorcommutatorgenerator
- 16. Multiple ChoiceA simple transformer consists of two coils of wire called the ___.input and output loopsstep-up and step-down generatorsalternating and direct currentprimary and secondary coils
- 17. Multiple ChoiceThe function of an electric motor is to change ___.chemical energy to electrical energyelectrical energy to chemical energyelectrical energy to mechanical energymechanical energy to electrical energy
- 18. Multiple ChoiceElectromagnetic induction is the process of producing an electric current by moving a loop of wire ___.through a magnetic fieldaround an iron corethrough a magnetic domainaround a magnetic pole
- 19. Multiple ChoiceThe atoms in a magnet are ___.arranged randomlyaligned according to magnetic fieldsnegatively chargedpositively charged
- 20. Multiple ChoiceA transformer that increases voltage is a ___.resistance transformerstep-down transformerstep-up transformervoltage motor
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