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Parallel circuit with internal resistance

  • Thread starter dbag123
  • Start date
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Homework Statement
Calculate current through the source
Homework Equations
P=UI, U=RI
4 resistors R1= 10 Ohm R2= 7 Ohm R3= 6 Ohm R4 = 18 Ohm, internal resistance of source is 0,5 Ohm and supply voltage is 27V

Total resistance in parallel resistors 1/R = 0.465 taking the inverse of that i get 2,15 Ohm. Add to that the internal 0,5 and the total comes out to 2,65 Ohm.

Total current would then be U/R --> 10,2A rounded up. If it is true that in a parallel circuit the voltage stays the same, than it stands to reason that the sum of the currents should add up to 10,2 but they dont. i get a total current of 12,577 just for the 4 resistors. What is happening here?
 
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1570119214640.png
 

mjc123

Science Advisor
820
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If the supply voltage is 27V, the internal resistance is 0.5Ω and the resistance of the parallel set is 2.15Ω, what is the voltage drop across the parallel resistors? (hint: it is not 27V)
 
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21,93V
 
Last edited:

mjc123

Science Advisor
820
372
And if you have a voltage drop of 21.93V across the 4 parallel resistors, what is the total current through them?
 
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10,2A
 

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