Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Need your help with parallel circuits

  1. Jan 7, 2006 #1
    I need to work out the total resistance of a heating element made up of 3 strips of resistive material in paralell. We are told that the unit is 12V and theheat is generated at a rate of 40W, I need to calculate the total resistance of the element. I kno I have to use the formular R=v²/r where R is the resistance, V is the voltage and r is the power(watts). i know that the voltage will be the same across all the strips but will the power, could you help me please?
  2. jcsd
  3. Jan 7, 2006 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    The power consumed is porportional to the total circiut resistance.

    Thiis is a pretty straight forward problem, don't over think it.
  4. Jan 7, 2006 #3


    User Avatar

    Start by drawing off the circuit, that'll help.
  5. Jan 7, 2006 #4

    what is the problem here?
  6. Jan 7, 2006 #5
    Inversely propotional.
  7. Jan 8, 2006 #6
    thanks for your help guys
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook