Science Test

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Science Test
2012-11-14 23:27:39

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  1. What happens to electrically neutral objects when they gain or lose electrons?
    They become charged
  2. What is the loss of unbalanced electric charge by an object?
    Electrical discharge
  3. Materials through which electric charges move easily through are called?
    electrical conductor
  4. Materials through which electric charge cannot move easily are called?
    electric insulator
  5. What are 3 examples of electric insulators?
    • 1.  Plastic
    • 2.  Wood
    • 3.  Glass
  6. Some of the best conductors of electric charge are ?
  7. An electrical charge is surround by an ??
    electron field
  8. Scientists know that there is an ___________________ region around charged ojects that apply an electric force.
  9. What is the force an electric field applies to another charged object?
    Electric force
  10. 2 negative objects ??
    repel each other away
  11. 2 positive objects  ??
    repel each other away
  12. A positive object and a negative object ??
    Attract each other
  13. What is the loss of an unbalanced electric charge?
    electric discharge
  14. What is a material in which electric charges connot easily move?
    electric insulator
  15. What is a material in which electric charges easily move?
    electric conductor
  16. What is the force that two electrically charged objects apply to each other?
    electric force
  17. What is the invisible region around a charged object where an electric force is applied?
    electric field
  18. An electric current that only flows in one direction is a ?
    direct current
  19. An electric current that frequently changes direction ia an ?
    alternating current
  20. Sources of energy can come from what 4 things?
    • 1.  Batteries
    • 2.  Generators
    • 3.  Solar cells
    • 4.  Fuel cells
  21. Energy transformations occur when current flows through a circuit that has ?
  22. Electric resistance is a measure of how  ??    it is for a current to pass through a material.
  23. Material with  ??? electrical resistance transform more electric eneergy into other types of energy, such as a ???
    • high
    • light
  24. Most conducotrs in a circuit are in the form of ??
  25. What are the 2 types of electric circuits?  How many paths do each have?

    not sure I got this right, hard to read your handwriting
    • 1.  single---one
    • 2.  parallel -- two
  26. What is the amount of energy used to move a
    coulamb(what is this?)  of electrons through the circuit?
  27. The circuit could also contain a ?? which transforms electric energy into?
    • motor
    • mechanical energy
  28. A machine that transforms mechanical energy to electrical energy
  29. A measure of how difficult it is for an electric current to flow in a material
    electric resistance
  30. Some magnetic materials such and iron and steel are grouped in
    magnetic domains