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Back EMF equation, need help

  1. Nov 6, 2016 #1
    1. The problem statement, all variables and given/known data
    An A/C starter has a 12V supply & a back EMF of 6V. If the resistance is 0.1 ohms, calculate current during start-up & while in operation

    2. Relevant equations
    E=IR
    Not sure what else? Sorry im stuck.

    3. The attempt at a solution
    Start up current
    E=IR
    12V=I x .01
    I = 120A

    operating current
    6V=I x .01
    I = 60A
     
  2. jcsd
  3. Nov 7, 2016 #2

    cnh1995

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    Homework Helper

    Looks correct.
     
  4. Nov 7, 2016 #3

    NascentOxygen

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    Staff: Mentor

    What is A/C an abbreviation for?
     
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