Find the potential Difference

  • Thread starter looi76
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  • #1
looi76
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Homework Statement


http://img241.imageshack.us/img241/1087/09052008hf9.png [Broken]
What is the potential difference across (i) AB (ii) BC.

Homework Equations


??

The Attempt at a Solution


(i) [tex]\frac{200}{400} \times 6 = 3V[/tex]

Is this right? :confused:
 
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Answers and Replies

  • #2
BishopUser
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I think the easiest way to do this would be to use equivalent resistances to find the current. After that it is very easy
 
  • #3
looi76
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I didn't understand...
 
  • #4
alphysicist
Homework Helper
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Hi looi76,

We know the total resistance between A and B is 200 ohms. What is the total resistance between B and C?
 
  • #5
looi76
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The total resistance between B and C is 100 because they are connected in parallel. So, [tex]\frac{200}{(100 + 200)} \times 3 = 2V[/tex]

Is this correct?
 
  • #6
Defennder
Homework Helper
2,592
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No, that is not the total resistance between B and C. They are both in parallel. What is the formula for resistance connected in parallel?
 

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