OT. Please tell me how to calculate this

Discussion in 'General Electronics Chat' started by AE35, Mar 2, 2006.

  1. AE35

    Thread Starter New Member

    Dec 1, 2005
    8
    0
    Hi all.

    If I have a a bulb connected to a 3V battery how do I calculate how many C that has been passed through it, when it has used 30 J?

    Thanks....hope I make sense.

    Nicholas
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    One volt equals one joule per coulomb. The rest is algebra: multiply both sides by C and divide both by volts.
    V = J / C
    C * V = J
    C = J / v
    C = 30J / 3v = 6.02x10^24 electrons.
     
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