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- 1. 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
- 2. Multiple Choice
What is the transfer of electricity in a generator?Mechanical to ElectricalPhysical to PotentialElectrical to MechanicalYogurt to Light - 3. Multiple ChoiceWhat is the transfer of electricity in a motor?chemical to mechanicalelectrical to mechanicalmechanical to electricalphysical to potential
- 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
What would happen if you broke a bar magnet into 8 pieces?
You would have 8 half magnets
You would have 4 complete magnets
You would have 8 complete magnets
They wouldn't be magnets anymore
- 6. Multiple ChoiceWhat is the device seen here?generatorelectric motorelectromagnetmagnet
- 7. Multiple ChoiceWhat is the relationship between electrical current and magnetic field strength in an electromagnet?When current is increased, magnetic field strength increasesWhen current is increased the strength of magnetic field decreasesWhen the current is decreased, the strenght of the magnetic field is increased.There is an "indirect proportion," meaning, if the value of one goes up, the value of the other goes down.
- 8. Multiple Choice
With electricity and magnetism we typically say like charges _________ and opposite charges ___________.
repel; attract
attract; repel
increase; decrease
decrease; increase
- 9. Multiple Choice
Which of the following are insulators?
copper
plastic
air
glass
water
- 10. Multiple Choice
Which of the following are conductors?
Copper
Water
Paperclips
Air
Glass
- 11. Multiple ChoiceSara rubs a balloon on her hair and charges both the balloon and her hair. What will happen if Tara holds the balloon close to her hair?Her hair will be repelled by the balloon because her hair and the balloon have the same charge.Her hair will be attracted to the balloon because her hair and the balloon have the same charge.Her hair will be repelled by the balloon because her hair and the balloon are oppositely charged.Her hair will be attracted to the balloon because her hair and the balloon are oppositely charged.
- 12. Multiple ChoiceIf the leaves of an electroscope spread apart, it indicates that ___.the leaves are neutral.the leaves have received a charge.no charge is moving through the electroscope.there is static electricity in the electroscope.
- 13. Multiple ChoiceElectric charge that has accumulated or built up on an object is referred to as ___.circuit electricity.current electricity.current circuit.static electricity.
- 14. Multiple ChoiceWhat is the rate at which charges pass a given point?electrical energyohmselectric currentvoltage
- 15. Multiple ChoiceWhat is the voltage if the current is 0.7 A and the resistance is 4 Ώ?28 V2.8 V5.7 V57 V
- 16. Multiple ChoiceWhat is the resistance if the current is 4 A and the voltage is 10 V?40 Ώ0.4 Ώ25 Ώ2.5 Ώ
- 17. Multiple ChoiceIn a series circuit with three bulbs, adding another bulb willmake the nearest bulb brighter.make some of the bulbs dimmer.make all of the bulbs dimmer.have no effect.
- 18. Multiple ChoiceWhat are the units for measuring the current present in an electrical circuit?ohmsvoltsampswatts
- 19. Multiple Choice
A magnetic field is __________ at both its poles
weakest
strongest
equal
- 20. Multiple Choice
A dangerous situation when too much current flows through wires is called a _____
blackout
electrical shortage
short circuit
- 21. Poll
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