Physics

Discussion in 'Homework Help' started by Soviet Union, Nov 11, 2012.

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Physics
  1. Unread #1 - Nov 11, 2012 at 2:14 PM
  2. Soviet Union
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    Physics
    If anyone could help that would be great!
    Resistor value / W = ?
    Power rating / W = 1
    Working current = 30 mA

    Any help would be great and an explanation would be even better :D

    Equations: P = I V and V = I R
     
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  3. Unread #2 - Nov 11, 2012 at 3:14 PM
  4. R
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    Physics
    P = IV

    1 = 0.03 V (30mA is 30x10^-3)
    V = 33.33...

    V = IR
    33.333.. = 0.03 x R
    R = 1111.11 ohms

    I could be wrong, I've not done physics for about 3 years. Answer looks a bit strange, but that's the best I can attempt =p.


    P= I^2 x R
    1 = 0.03^2 x R
    R = 111.11 ohms

    Both seem to work out the same, so I'm assuming this is correct, unless I've gotten the mA wrong.
     
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  5. Unread #3 - Nov 11, 2012 at 7:45 PM
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    Physics
    Answered. Closed :)
     
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