Voltage drop across a wire

  1. Compute the voltage drop along a 25 m length of household no. 14 copper wire (used in 15A circuits). The wire has diameter 1.628 mm and carries a 15 A current.


    Vdrop=I*R

    R=rho(L/A)




    I just plugged the resistivity of copper wire which is 1.72*10^-8, length, and area in to find the resistance. Which is .206 and then I found the voltage drop of 3.09v which was wrong what did i do wrong?
     
  2. jcsd
  3. LowlyPion

    LowlyPion 5,335
    Homework Helper

    Perhaps you should show your calculation?
     
Know someone interested in this topic? Share a link to this question via email, Google+, Twitter, or Facebook

Have something to add?