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Question on electricity. AWESOME

  1. Mar 6, 2010 #1
    Physics electricity question!?
    A power supply of e.m.f E and internal resistance R is connected to a 10kO(O for ohm) resistor. The current drawn from the power supply is 0.91 A. A voltmeter of internal resistance 10kO is connected in parallel with the 10kO resistor, and read 8.3V. Calculate the e.m.f. and the internal resistance of the power supply.

    answer is 10V and 1kO from the book.

    thanks.
     
  2. jcsd
  3. Mar 6, 2010 #2

    tiny-tim

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    Science Advisor
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    Welcome to PF!

    Hi henglin! Welcome to PF! :smile:

    (have an ohm: Ω :wink:)

    Are you sure the voltmeter isn't one kΩ ? :confused:
     
  4. Mar 6, 2010 #3
    Re: Welcome to PF!

    I'm sure this problem is correct. Note that the 0.91 A is measured before the voltmeter
    is connected.
     
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