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zeig_101

  • 2 years 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
    • 2 years ago
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    Ohm's law: I=V/R

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

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

  4. inkyvoyd
    • 2 years 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
    • 2 years ago
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    ok, so, .5 A=100V/X?

  6. inkyvoyd
    • 2 years ago
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    yup

  7. zeig_101
    • 2 years ago
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    so, 50a=x?

  8. inkyvoyd
    • 2 years ago
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    no. A is a unit.

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

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

  11. inkyvoyd
    • 2 years 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
    • 2 years ago
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    What do the things in I=V/r mean?

  13. inkyvoyd
    • 2 years 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
    • 2 years ago
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    ok, so its really C=V/R?

  15. inkyvoyd
    • 2 years 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
    • 2 years ago
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    ok

  17. inkyvoyd
    • 2 years 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
    • 2 years ago
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    ok

  19. zeig_101
    • 2 years ago
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    so 0.5=100/R

  20. inkyvoyd
    • 2 years ago
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    yes.

  21. zeig_101
    • 2 years ago
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    now where do i go from there?

  22. inkyvoyd
    • 2 years ago
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    Multiply both sides by R.

  23. zeig_101
    • 2 years ago
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    so,0.5R=100?

  24. inkyvoyd
    • 2 years ago
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    Yup.

  25. zeig_101
    • 2 years ago
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    ok, so divide by .5?

  26. zeig_101
    • 2 years ago
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    R=100/0.5 R=200

  27. inkyvoyd
    • 2 years ago
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    Yes.

  28. inkyvoyd
    • 2 years ago
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    Can you do number 2?

  29. zeig_101
    • 2 years 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
    • 2 years ago
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    btw, the units for the resistance are in ohms.

  31. inkyvoyd
    • 2 years ago
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    no, power is P=IV x.x

  32. inkyvoyd
    • 2 years ago
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    sorry they are different formulas.

  33. zeig_101
    • 2 years 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
    • 2 years ago
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    100 watts

  35. zeig_101
    • 2 years ago
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    ok

  36. inkyvoyd
    • 2 years ago
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    Do you need help with the rest?

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