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32 Cards in this Set
- Front
- Back
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1. What type of energy is associated with electric current?
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Electric Energy
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2. What is one difference between a galvanometer and an electric motor?
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An electric motor has an armature that spins continuously.
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3. What is the process of generating an electric current from the motion of a conductor in a magnetic field?
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Induction
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4. What is a DC generator the same as?
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an electric motor
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5. What is a device that increases or decreases voltage?
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transformer
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6. What is an alternating current transmitted at high voltages, but usually used at low voltages?
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Electric current coming from a power plant.
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7. What does an alternating current charges do?
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It moves back and forth in the circuit
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8. What is a solenoid with a ferromagnetic core?
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An electromagnet
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9. Name 3 things that involve the use of an electromagnet.
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Recording a tv show on a tape, recording audio, metal objects being picked up by a magnetic crane lift.
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10. What is the relationship between electricity and magnetism?
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electromagnetism
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11. What is the ability to move an object over a distance?
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Energy
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12. What do the two ends of a solenoid act like?
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poles
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13. What is used to turn the pointer of a galvanometer?
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an electric motor
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14. Name the parts of an electric motor.
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brushes, armature, energy source, commutator,wire, magnets
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15. Name the parts of an AC generator.
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brushes, armature, slip rings, wire, crank
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16. What occurs when a wire with a current is placed in a magnetic field?
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Electrical energy transforming into mechanical energy.
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17. Where is current conducted in order to reverse the direction of current in a motor?
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through the brushes to the commutator.
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18. What type of current is produced by a battery?
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Direct current.
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19. What energy does a generator transform?
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Mechanical energy into electrical energy.
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20. What is produced when there is a current in the primary coil of a transformer?
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A magnetic field.
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21. What is a device used to measure small currents?
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A galvanometer.
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22. What is a device that supplies the mechanical energy to turn the armature of a generator?
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A turbine.
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23. How can you increase the strength of an electromagnet’s field?
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By putting a stronger ferromagnetic material in the middle of the solenoid.
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24. What is a coil of wire with a current?
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A solenoid.
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25. What does an electric current produce?
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A magnetic field.
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26. Name 3 characteristics of a magnetic field that is produced by a current.
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The field can be turned on or off, it can have it's direction reversed, and it can have its strength changed.
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27. What device transforms electrical energy into mechanical energy?
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electric motor
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28. What repeatedly reversed the flow of current through the armature in an electric motor?
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the commutator
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29. What device increases voltage?
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A step-up transformer.
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30. What is produced in secondary coils of transformers?
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An electric current.
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31. What would happen to the voltage if the number of loops in a secondary coil of a step down transformer were decreased?
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The voltage would decrease.
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32. Be able to identify the two types of transformers and their parts. Refer to page 100 in text.
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Step-up transformer and a Step-down transformer
Parts: Primary coil and Secondary coil. |
