science test pg.2

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Author:
julia1
ID:
204664
Filename:
science test pg.2
Updated:
2013-03-03 16:23:56
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March 11 science test
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science test pg 2 march 11
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  1. Good conductors are
    metal
  2. Poor conductors are
    cotton, wood and plastic
  3. A device that controls the current in a circuit
    switch
  4. what does a dry cell produce
    direct current
  5. What happens in lightening
    the negative water particles settle in a cloud near the bottom
  6. What happens when lightning strikes a lightning rod on top of a building?
    electrical energy flows through a wire and into the ground
  7. What do similar electrical charges do?
    They repel each other
  8. What type of energy does lightning give off?
    light, heat, electrical and sound
  9. What are electrical wires often covered with and why?
    rubber because rubber is a good insulator
  10. What device produces alternating current? r
    genarator

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