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Math Help - Uncertainty calculations

  1. #1
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    Uncertainty calculations

    Hello,

    I'm having problems calculating the uncertainty for Q(energy).

    The formula is as follows

    Q = VIt

    V=voltage
    I= current
    t=time

    say V=10 +-0.05
    say I= 5 +-0.005
    say t= 120 +-0.005

    What would the uncertainty in q be? As I understand it varies for each new reading of t in regards to Q.
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  2. #2
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    Quote Originally Posted by Mouseman View Post
    Hello,

    I'm having problems calculating the uncertainty for Q(energy).

    The formula is as follows

    Q = VIt

    V=voltage
    I= current
    t=time

    say V=10 +-0.05
    say I= 5 +-0.005
    say t= 120 +-0.005

    What would the uncertainty in q be? As I understand it varies for each new reading of t in regards to Q.
    \frac{\delta Q}{Q} = \frac{\delta V}{V} + \frac{\delta I}{I} + \frac{\delta t}{t}.

    Substitute the data and solve for \delta Q.
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