science 12

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science 12
2015-04-10 16:42:15
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  1. photon
    a small package of light that acts like a particale.
  2. charging by conduction
    charging an object by allowing it to come in contact with an object that already has an electrical charge.
  3. charging by induction
    charging an object without direct contact between the object and a charge
  4. electrical current
    the amount of charge that travels past a fixed point in an electric circuit each second
  5. conventional current
    current that flows from the positive side of the battery to the negative side.

    **This is the way current is draw in circuit diagrams, even though it is wrong.
  6. resistance
    the ability of a material to impede the flow of charge
  7. open circiut
    a circit that does not have a complete connecton between the two sides of the power source. As a result, current doesn't flow.
  8. The force between the south pole of a magnet and the north pole of another magnet is measured. If the distance between the poles is increased by a factor of 3, how does the new force compare to the old one? Is the force attractive or repulsive?
     The force is divided by 9.  The force is attractive since the poles are opposite.
  9. Two charged particles are placed 10 cm from each other and the resulting force is measured. the charge on object #1 is then doubled and the charge on object #2 is left the same.Also the distance between is reduced to 5 cm. How does the new force compare to the old force?
    the new force is 8 times stronger that the old one
  10. What causes the electromagnetic force?
    the exchange of photons
  11. Given your answer is #5 why don't charged particles glow?

    **Under the right conditions charged particles can emit visible light.  At those times you can say that the charged particles do glow.
  12. If you were to use a positively charged rod to charge an object by induction what charge will the object have
    a negatively charged object
  13. If you were to use a positively charged rod to charge an object by conduction what charge will the object have?
  14. An electrical circuit uses a large voltage but a small current. Is the energy of each electron high or low? Are there many electrons flowing throught the circuit or few? Is the circuit dangerous?
    each electron has high energy, few electrons flow through the circuit, and the circuit could be dangerous

    **Even though there are few elections, they each have high energy so the circuit could be dangerous.
  15. Under what conditions is an electrical circuit reasonably safe?
    when both the current and the voltage is low
  16. What is wrong with conventional current?
    conventional current assumes that electricity is the flow of positive charges
  17. You have 2 wires one is long one is short other than that they both are the same. Which has more resisitance?
    the long one
  18. You have two wires. One is thin and the other is very thick.  When the same current is run through each wire, which will get hotter?
    • the thin one because its so thin that it will heat up more than the thick one
  19. In which circuit  will make the bulb glow?
    • b because the open switch is parallel to the light bulb so the current can still flow through the bulb.
  20. Three lights are in a circuit. When one burns out they all go out. Are they in a Paralell circuit of a series circuit?
  21. If it takes a flow of charged particles to make a magnet where is the charged flow in a permanent magnet?
    the flow of charged particles is the motion of the electrons in its atoms
  22. Is it possible to have a permanent magnet with only a north pole?
  23. Is it possible to make a magnet from something that is not a magnet?
    • yes, if the material responds strongly enough to a magnet, you can align its atoms to make it a magnet.
  24. If material does not respond to a magnet what can you conclude about the atoms in that material?
    the atoms are not aligned

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