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1 second = 1ohm x 1farad?

  1. May 27, 2013 #1
    How can I show that the RC circuit has dimensions of time? 1 second = 1ohm x 1farad?
  2. jcsd
  3. May 27, 2013 #2


    Staff: Mentor

    Expand out Ohm and Farad in terms of base units and simplify.
  4. May 27, 2013 #3
    time constant = R x C
  5. May 27, 2013 #4


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Ohm's Law and the well-known relation between Q,C & V will help with that.

    Or use technician's suggestion, but somehow that feels like a cheat to me.
  6. May 28, 2013 #5
    I agree! The time constant confirms that RC must be seconds but you do need to determine the dimensions of R and C.
    You have a similar post regarding volts, webers and seconds. Faradays law gets you started but here also the quantities webers, volts etc need to be expressed as dimensions
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