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eastcoastrockerdude
eastcoastrockerdude asked in Science & MathematicsEngineering · 9 years ago

Question on Ohm's Law?

Double check me.

Assume 12 volts is constant.

If I want to use 4 watts power, would I use a 36 Ohm resistor?

If I want to use 27 watts power, I w ould use a 5.33 Ohm resistor?

5 Answers

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  • Clive Mckraken
    Lv 5
    9 years ago
    Favorite Answer

    You got it right

    Source(s): Electrical engineer
  • billrussell42
    Lv 7
    9 years ago

    12²/36 = 4 watts

    and

    12²/5.33 = 27 watts

    now that was not very difficult, was it.

  • Anonymous
    9 years ago

    I really do not understand your question.

    The values you give, the resistors would use the 4 and 27 watt.

    So how are You going to use 4 or 27 watt if they're already being used?

    Maybe I'm being pedantic.

  • Helmi
    9 years ago

    Basic Formula Ohm's Law :

    i) V=IR

    ii) P=IV

    If P=4W

    P=V^2/R

    4=12^2/R

    R=36ohm

    If P=27W

    P=V^2/R

    27=12^2/R

    R=5.333ohm

    You're Answer Definitely Correct =)

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  • Colin
    Lv 7
    9 years ago

    P = E^2/R

    R = E^2/P = 144/P

    ...so the values you give are correct.

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