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Homework Help: Conversion Factor

  1. Apr 15, 2009 #1
    I have a list of readings in mV and it says "The metre readings have a conversion factor of 9.29 V/J.

    If there is a reading of 10 mV would you just do 10/9.29 to convert to Joules?

  2. jcsd
  3. Apr 15, 2009 #2
    10mV is in miliVolts, or 10mV = (10/1000) V

    So to convert 10mV into, let's call it Unit J (instead of Joules for a minute) (instead of mJ), using the given conversion, mathematically it's:

    [tex] 10mV = {{10mV \over 1000{mV \over V}} \over 9.29 {V \over J}} [/tex]

    (writing it out that way with is just to maybe help you see how the units work)

    EDIT: But as an important note... Volts aren't the same as Joules
    A Joule is a unit of energy, and 1 Volt is equal to 1 Joule of energy per Coulomb of charge, so V = J/C, in general. You can't convert from Volts to Joules, but you can convert from V to J/C, which is what I assume you are really doing, and the 9.29 has some unit related to charge.
    Last edited: Apr 15, 2009
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