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  #1  
Old 09-27-2010, 07:37 AM
sadaf sadaf is offline
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Default current divider rule

my question is:
in cdr formula why don't we put the resistance in the numerator of that resistor across which we want to find out the current...

Ia= (Rt*It)/(Ra)

or in the special case of CDR

Ia= (Rb*It)/(Ra+Rb)



according to me, as current is inversely related with resistance so that's why.....................



what do you think?give me your thoughts about this........?
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Old 09-27-2010, 11:28 AM
t_n_k t_n_k is offline
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Quote:
my question is:
in cdr formula why don't we put the resistance in the numerator of that resistor across which we want to find out the current...

Ia= (Rt*It)/(Ra)
If you mean Rt=Ra+Rb then clearly you'll get the wrong result. Ia would exceed It - which would be unexpected to say the least!

Your question isn't clear to me. What is the heart of the problem from your perspective?
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  #3  
Old 09-28-2010, 02:07 AM
Ghar Ghar is offline
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Current is inversely related with resistance yes, but with current division you have two (or more) resistors in parallel rather than two (or more) resistors in series.

The branch with 0 resistance would get 100% of the current.
With a voltage divider if one resistance is 0 that resistance gets 0% of the voltage.

It's an inverted situation, you swapped voltage and current as well as series and parallel.
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  #4  
Old 10-06-2010, 05:07 PM
sadaf sadaf is offline
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OK i understood......
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