4th grade science Chap. 13 test

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bdoering
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225401
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4th grade science Chap. 13 test
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2013-06-29 22:37:42
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science chapter 13 test
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Study for 4th grade science chapter 13 test
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  1. A device that transforms electrical energy into movement or mechanical energy is a...
    electric motor
  2. Lightning forms because negative water particles settle in a cloud near the ...
    bottom
  3. What types of energy does lightning give off? (there are 4)
    light energy, heat energy, electrical energy and sound energy
  4. Electrical wires are often covered with rubber, because rubber is a good....
    insulator
  5. When lightning strikes a lightning rod electrical energy flows through a wire and into the....
    ground
  6. The current produced by dry cells is called...
    direct current
  7. What happens when the current travels through the second transformer before entering your home?
    The transformer decreases the voltage.
  8. Alternating current is produced by a device called a...
    generator
  9. How do similar electrical charges react to each other?
    They repel each other.
  10. Name some materials that are NOT good conductors...
    cotton, wood, plastic
  11. What is the name for a device that controls the current in a circuit?
    switch
  12. Electrical devices in the home are connected in what kinds of circuits?
    parallel circuits.
  13. In a magnet what describes the way the poles effect each other.
    Like poles repel each other.
  14. True or false?  Some of the particles inside an atom have a positive electrical charge.
    true
  15. True or false?  Atoms usually have an overall positive charge.
    false
  16. Name some things to do if you hear thunder or see lightning.
    • Get out of the water.
    • Don't use the telephone.
    • Stay away from high places and tall objects.
  17. Name some good conductors.
    metal and water
  18. A material through which electricity does NOT flow.
    insulator
  19. The electricity that flows through a circuit is called...
    current electricity
  20. True or false?  Inside atoms are tiny particles.
    true
  21. True or false?  Some of the particles inside an atom have a negative electrical charge.
    True
  22. A region of magnetic force surrounding a magnet.
    magnetic field
  23. A movement of an electrical charge from one object to another.
    discharge
  24. A magnet created by using electrical current
    electromagnet
  25. When each object in a circuit is connected to the cell separately and one object can be on while the other is off.
    parallel circuit
  26. The buildup of electrical charge on a material.
    static electricity
  27. Two objects connected to a cell in a single path (causing one object not to work if the other object is not working).
    series circuit
  28. Where the pull of a magnet is strongest.
    poles
  29. The complete path that electricity can move through.
    circuit

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