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- 1. Multiple ChoiceGenerators are devices that convert _____ energy into _____ energy.chemical; mechanicalmechanical; electricalelectrical; mechanicalpotential; kinetic
- 2. Multiple Choice
In a _______ a spinning turbine moves magnets which generates an electric current.
Motor
Generator
- 3. Multiple Choice
What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?Electromagnet
Generator
Electron Magnet
Motor
- 4. Multiple ChoiceWhat happens to the strength of an electromagnet as you add more coils around it?IncreasesDecreasesStays the sameStops completely
- 5. Multiple Choice
What can you do to make electromagnets stronger?
Increase number of coils of wire.
Increase number of batteries used.
Both A and B.
Neither A nor B.
- 6. Multiple Choice
What is produced by moving a permanent magnet through a coil of copper wire?
electricity
electromagnet
light
sound
- 7. Multiple Choice
Which best describes how a motor works?
When a fan blows on a wire, it causes it to spin, creating a force.
When a fan blows on a wire, it causes it to spin, creating an electrical current.
When a wire that carries electrical current is placed in zero gravity, the wire experiences a force.
When a wire that carries electrical current is placed in a magnetic field, the wire experiences a force.
- 8. Multiple Choice
Which statement best explains the flow of energy through a motor?
battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy
battery--> magnet--> electrical current--> copper wire rotor--> mechanical energy
magnet--> mechanical energy--> copper wire rotor--> battery--> electrical current
magnet--> copper wire rotor--> mechanical energy--> battery--> electrical current
- 9. Multiple ChoiceWhich part of a circuit allows electrical current to flow between the battery and light bulb?loadpower sourceresistorconductor
- 10. Multiple ChoiceWhich of these can apply a force without actually touching an object?motorgeneratormagnetic fieldturbine
- 11. Multiple ChoiceElectric motors are devices that convert _____ energy into _____ energy.electrical; mechanicalmechanical; electricalchemical; potentialmechanical; kinetic
- 12. Multiple ChoiceWhen John plugs in a toy and turns it on, a marble is carried up to the top of a slide. At the top, a marble is released and it goes down a slide. What kind of energy transformation occurs to make this toy work?
chemical to heat
electrical to chemical
sound to electrical
electrical to mechanical
- 13. Multiple ChoiceIn large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.WindWaterMagnetsCircuits
- 14. Multiple ChoiceWhen a wire loop is connected to a battery, ______________ is produced in the loop.a "Dark Side" force fieldan electric fielda magnetic fielda baseball field
- 15. Multiple ChoiceIn a motor, a ___________ provides the necessary push to make current flow.crane armcopper wirebatterypiece of iron
- 16. 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 generators
spin the turbine generators
reduce friction in the turbine generators
reduce emissions from the turbine generators
- 17. Multiple ChoiceWhich device uses mechanical energy to produce electrical energy?Electric MotorMagnetGeneratorSolar Cell
- 18. Multiple ChoiceWhat is the fan that turns the magnet inside a generator called?electromagnetturbinesolar panelpinstock
- 19. Multiple ChoiceA coil of wire that has a soft iron core and that acts as a magnet when an electric current is in the coil is call a(n)FerromagnetElectromagnetPermanent magnetTemporary magnet
- 20. 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.
- 21. Multiple ChoiceThis is a picture of a simple electromagnet. How can the electromagnet be made stronger?Add more coils of wire to the nail.Use a smaller battery.Reverse the poles of the magnet.Remove all the coils and the nail.
- 22. Multiple ChoiceMs. J's students are complaining that it is hot in the classroom. She plugs in the fan and turns it on... Which energy transformation occurs?
mechanical to electrical
electrical to mechanical
chemical to mechanical
electromagnetic to mechanical
- 23. Multiple Choice
Which of the following provide a permanent magnetic field in a motor?
roto coils
field magnets
commutator
armature
- 24. Multiple Choice
Which of the following allows the current in the roto coils to change directions every half turn?
Powersupply
field magnets
commutator
armature
- 25. Multiple Choice
Which of the following is spun due to the interactions between the magnetic fields?
powersupply
field magnets
commutator
armature
- 26. Multiple ChoiceWhich is the device in DC Generators that converts AC current into DC currentbrushescommutatorstatorarmature
- 27. Multiple ChoiceWhich of these is NOT a part of a DC Generator.Slip ringscommutatorbrushesstator
- 28. Multiple ChoiceThe process of generating the current in a conductor is called asElectro motive forceElectromagnetic inductiongenerator energy conversioninduced voltage
- Answer choicesTagsAnswer choicesTags