Discussion :: Parallel Circuits - General Questions (Q.No.25)
Which component is open?
Answer: Option C
No answer description available for this question.
|Sasi said: (Jan 10, 2011)|
|If R3 get open means R4 also opened.
So, we can get a maximum output.
|Krishnan said: (May 22, 2011)|
|I don't understand its meaning.|
|Deepti said: (Jun 22, 2011)|
|Total current = 21mA
Current through R1 & R2 = 18mA
So it needs R1 & r2 equivalent = 2/3 which is true.
So R1 R2 not open
Now total voltage acrros last branch = 12v
which is given by R4 ( 4Kohm * 3mA)so there is no need of R3
Hence it is opened.
|Gopiram Verma said: (Jul 31, 2011)|
|Good explanation deepti.|
|Hanish said: (Dec 7, 2011)|
|Sreeyush Sudhakaran said: (Feb 20, 2012)|
here we can see that IR4=I3 (0.003A) ie no current is flowing through R3
Also It=IR1+R2+IR3+IR4=0.012+0.006+0.004+0.003=0.025 Which is
By open circuiting R3 we get It=0.012+0.006+0.003=0.021 which is correct.
So R1 is open in the circuit
|Kishu said: (Jun 4, 2012)|
|Answer R1 is open because current not flow in R1 because there is short circuit across R1 current always flow in low resistive path.|
|Saurabh said: (Jul 18, 2012)|
|This is not clear how R3 is open connection means only one pole is connected.|
|Subedar Sk Shakya said: (Jan 30, 2013)|
|As we know in parallel circuits current divides& voltage remains same here the first amp meter shows 0.021A is the total current flowing through the R1,R2,R3,R4 and second one shows the current flowing through R3&R4
Now current reading for first one r1*r2/r1+r2=1*2/1+2 =2/3 I=V/R so(12)/(2/3)= 18ma now remains 3ma for second one so it clearly shows again I= V/R =12/4k=3ma So no need of R3.
Here R3 is Open.
|Jaganadhan.R said: (Jun 7, 2013)|
Total current = 21mA.
Current required by R1 and R2 = 18mA.
So for remaining 3mA(21mA -18mA), R4 = 4K is enough no need for R3.
|Aneel said: (Jun 9, 2013)|
|How to calculate total current?|
|Suresh B said: (Jul 14, 2014)|
|1 amp = 1000 mA.
0.021 A = 21 mA.
|Priya said: (Dec 15, 2014)|
|@Kishu is right. We can't connect volt and ammeters directly because their will be short circuit.|
|Hima.V.M said: (Nov 15, 2016)|
|It's a clear explanation, Thank you @Deepti.|
|Naveen said: (Jun 27, 2017)|
|Perfect explanation, Thanks.|
|Mani said: (May 1, 2018)|
|Here we have a total current of the 21m amp,
Current across R1is.
Current across R2 is;
Remaining current is 3m amp.
Then current across R4 is,
Hence resistor R3 is open circuit.
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