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physics doubt

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T.Q:
Three identical resistors are connected across a potential difference V so that one of them is in parallel with the other two which are connected in series. The power dissipated through the first one, compared to the power dissipated by each of the other two, is approximately

A   the same
B   half as much
C   twice as much
D   four times as much



which one is the answer & explain why ?

~ A.F ~:

--- Quote from: T.Q on April 27, 2010, 09:47:20 am ---Three identical resistors are connected across a potential difference V so that one of them is in parallel with the other two which are connected in series. The power dissipated through the first one, compared to the power dissipated by each of the other two, is approximately

A   the same
B   half as much
C   twice as much
D   four times as much



explain why ?

--- End quote ---

The answer is D..four times as much..

here's the deal:

Voltage for the lone resistor= V..and voltage for both of the resistors connected in parallel is also V..right?

now the volatage for each of the resistors in series = 0.5V..right?

P=V2 /R

therefore, for lone resistor P=V2 /R

for each of the  resistors in series: P= (0.5V)2 /R= 0.25V2 /R

1/0.25=4.

got that?  ::)

T.Q:
ya i got it

thanx  :)

+rep

~ A.F ~:
Any time :)

and Thanks 4 the +rep. :D

nid404:
A.F- I told you..you are mind-blasting! :)
+ rep

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