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zeig_101

  • one year ago

*reward: 1 medal for answers* 1) If the current in a wire is at 0.5 A and the voltage is measured at 100 volts, what is the resistance in the wire? 2)What is the electric power used by an appliance if the current is 2 A and the voltage is 50 volts? 3)How are sound waves produced, and what impacts do different types of matter have on the speed of the wave? 4)What is the electromagnetic spectrum? Explain and give an example. 5)http://img254.imageshack.us/img254/6528/459431120201182932am187.png In the figure shown, how could you determine the wavelength? 6)Explain how you can quickly determine whether a string of lights is wired in series or in parallel.

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  1. inkyvoyd
    • one year ago
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    Ohm's law: I=V/R

  2. zeig_101
    • one year ago
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    See, I dont know how to use Ohm's law

  3. inkyvoyd
    • one year ago
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    For number one, I=0.5 and V=100

  4. inkyvoyd
    • one year ago
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    so you just back substitute the numbers in: (0.5)=100/R Next you isolate R. 0.5R=100 R=200

  5. zeig_101
    • one year ago
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    ok, so, .5 A=100V/X?

  6. inkyvoyd
    • one year ago
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    yup

  7. zeig_101
    • one year ago
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    so, 50a=x?

  8. inkyvoyd
    • one year ago
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    no. A is a unit.

  9. inkyvoyd
    • one year ago
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    It's not a variable. If it helps you, use Amps instead of A

  10. zeig_101
    • one year ago
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    Ok, I don't get this can you walk me through it?

  11. inkyvoyd
    • one year ago
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    Okay. We know that I=V/R. We also know that I=0.5Amps and V=100Volts Do you follow?

  12. zeig_101
    • one year ago
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    What do the things in I=V/r mean?

  13. inkyvoyd
    • one year ago
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    It's a relationship between current, voltage, and resistance. I is a variable that represents current. V is a variable that represents voltage. R is a variable that represents resistance. We usually give these measurements in Amperes (A), Volts (V) and Ohms (omega), respectively.

  14. zeig_101
    • one year ago
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    ok, so its really C=V/R?

  15. inkyvoyd
    • one year ago
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    We don't use C for current. We use I. This is out of habit, so use I okay?

  16. zeig_101
    • one year ago
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    ok

  17. inkyvoyd
    • one year ago
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    (In mathematics we often encounter constants and we represent them with C's. If we used C for current it would be confused with other values and would not be clear). BUt essentially yes, the relationship is I=V/R

  18. zeig_101
    • one year ago
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    ok

  19. zeig_101
    • one year ago
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    so 0.5=100/R

  20. inkyvoyd
    • one year ago
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    yes.

  21. zeig_101
    • one year ago
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    now where do i go from there?

  22. inkyvoyd
    • one year ago
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    Multiply both sides by R.

  23. zeig_101
    • one year ago
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    so,0.5R=100?

  24. inkyvoyd
    • one year ago
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    Yup.

  25. zeig_101
    • one year ago
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    ok, so divide by .5?

  26. zeig_101
    • one year ago
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    R=100/0.5 R=200

  27. inkyvoyd
    • one year ago
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    Yes.

  28. inkyvoyd
    • one year ago
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    Can you do number 2?

  29. zeig_101
    • one year ago
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    What is the electric power used by an appliance if the current is 2 A and the voltage is 50 volts? I=V/r 2=50/r 2r=50 r=100?

  30. inkyvoyd
    • one year ago
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    btw, the units for the resistance are in ohms.

  31. inkyvoyd
    • one year ago
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    no, power is P=IV x.x

  32. inkyvoyd
    • one year ago
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    sorry they are different formulas.

  33. zeig_101
    • one year ago
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    What is the electric power used by an appliance if the current is 2 A and the voltage is 50 volts? P=I*V? P=2A*50V P=100?

  34. inkyvoyd
    • one year ago
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    100 watts

  35. zeig_101
    • one year ago
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    ok

  36. inkyvoyd
    • one year ago
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    Do you need help with the rest?

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