1. Mar 6, 2010 #1

   henglin

   

   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.

    

   henglin, Mar 6, 2010
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3. Mar 6, 2010 #2

   tiny-tim

   

   Science Advisor

   Homework Helper

   Welcome to PF!
   
   Hi henglin! Welcome to PF!
   
   (have an ohm: Ω )
   
   Are you sure the voltmeter isn't one kΩ ?

    

   tiny-tim, Mar 6, 2010
4. Mar 6, 2010 #3

   willem2

   

   Re: Welcome to PF!
   
   

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

    

   willem2, Mar 6, 2010

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