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Direct Current circuits

  • Thread starter Gemy4
  • Start date
  • #1
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Homework Statement


What is the equivalent resistance of the combination of identical resistors between points a and b in the figure below?


Homework Equations


Series= Req= R1 + R2 + R3 etc
Parallel = Req= (1/R1 + 1/R2 + 1/R3 etc)^-1


The Attempt at a Solution


Req= R1 + (1/3R) + R3

I dont know what to do from here.
 

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Answers and Replies

  • #2
rl.bhat
Homework Helper
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Parallel= Req= R1 + R2 + R3 etc
Series= Req= (1/R1 + 1/R2 + 1/R3 etc)^-1

These equations are wrong. The correct ones are
series= Req= R1 + R2 + R3 etc
Parallel = Req= (1/R1 + 1/R2 + 1/R3 etc)^-1
 
  • #3
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Thank you is this correct I only have one more submission
 
  • #4
rl.bhat
Homework Helper
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Req= R1 + (1/3R) + R3
Check the second term in the equation.
 
  • #5
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I tried that answer already and it says "Check the syntax of your response".
 
  • #6
ideasrule
Homework Helper
2,266
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Req= R1 + (1/3R) + R3
Check the second term in the equation.
The second term is right if he means 1/3 R and not 1/(3R). However, what is R1 and R3 in terms of R? Can you simplify the equation?
 
  • #7
16
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There are no numerical values for R. I asked my friend and the correct answer is 2 + (3)^-1.

Not sure how she got it.
 
  • #8
ideasrule
Homework Helper
2,266
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I know there are no numerical values for R, which is why I asked how R1 and R3 relate to R. Look at the diagram and figure out what R1 and R3 are in terms of R.
 

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