What is the value of the current (i) and what is the right way to do it?
What exactly went wrong with the below method?
Here, in the same circuit I am getting a different value for the current in the mid wire only by rearranging the circuit.
I was trying to solve this unbalanced Wheatstone bridge and found that the current ($i$) in the mid wire (in image 1) is 3 A. This result was achieved by using the node voltage method.
Then I rearranged the same circuit to the form shown in the second image.
And at this point I flipped the right half of the circuit so as to obtain the equal resistors on the same side.
Now I again rearranged the circuit as shown.
Here, the final circuit is a balanced Wheatstone bridge and thus the current ($i$) must be 0 A.
So clearly something went wrong in there.
I posted a question before this one just to make sure that there is no mistake in rearranging the circuit in the way I have done.
The mid wire is a complete connected wire. The gap in the mid wire near the arrow was inevitable.
current circuit-analysis wheatstone-bridge nodal-analysis
New contributor
|
show 1 more comment
What exactly went wrong with the below method?
Here, in the same circuit I am getting a different value for the current in the mid wire only by rearranging the circuit.
I was trying to solve this unbalanced Wheatstone bridge and found that the current ($i$) in the mid wire (in image 1) is 3 A. This result was achieved by using the node voltage method.
Then I rearranged the same circuit to the form shown in the second image.
And at this point I flipped the right half of the circuit so as to obtain the equal resistors on the same side.
Now I again rearranged the circuit as shown.
Here, the final circuit is a balanced Wheatstone bridge and thus the current ($i$) must be 0 A.
So clearly something went wrong in there.
I posted a question before this one just to make sure that there is no mistake in rearranging the circuit in the way I have done.
The mid wire is a complete connected wire. The gap in the mid wire near the arrow was inevitable.
current circuit-analysis wheatstone-bridge nodal-analysis
New contributor
3
this question was at first asked in physics stack exchange by me but it was unfortunately put on hold. link of first question -- physics.stackexchange.com/questions/450822/…
– Feels awesome
2 days ago
2
Didn't we just go through all this, like a day ago?
– jonk
2 days ago
1
that was a kind guy who posted my question again as the one that i posted was put on hold of some unknown reason . as the qs he posted has some errors I posted it again .
– Feels awesome
2 days ago
3
Possible duplicate of What's wrong with this Wheatstone bridge?
– fhlb
2 days ago
ya I have posted it again to get better ans
– Feels awesome
2 days ago
|
show 1 more comment
What exactly went wrong with the below method?
Here, in the same circuit I am getting a different value for the current in the mid wire only by rearranging the circuit.
I was trying to solve this unbalanced Wheatstone bridge and found that the current ($i$) in the mid wire (in image 1) is 3 A. This result was achieved by using the node voltage method.
Then I rearranged the same circuit to the form shown in the second image.
And at this point I flipped the right half of the circuit so as to obtain the equal resistors on the same side.
Now I again rearranged the circuit as shown.
Here, the final circuit is a balanced Wheatstone bridge and thus the current ($i$) must be 0 A.
So clearly something went wrong in there.
I posted a question before this one just to make sure that there is no mistake in rearranging the circuit in the way I have done.
The mid wire is a complete connected wire. The gap in the mid wire near the arrow was inevitable.
current circuit-analysis wheatstone-bridge nodal-analysis
New contributor
What exactly went wrong with the below method?
Here, in the same circuit I am getting a different value for the current in the mid wire only by rearranging the circuit.
I was trying to solve this unbalanced Wheatstone bridge and found that the current ($i$) in the mid wire (in image 1) is 3 A. This result was achieved by using the node voltage method.
Then I rearranged the same circuit to the form shown in the second image.
And at this point I flipped the right half of the circuit so as to obtain the equal resistors on the same side.
Now I again rearranged the circuit as shown.
Here, the final circuit is a balanced Wheatstone bridge and thus the current ($i$) must be 0 A.
So clearly something went wrong in there.
I posted a question before this one just to make sure that there is no mistake in rearranging the circuit in the way I have done.
The mid wire is a complete connected wire. The gap in the mid wire near the arrow was inevitable.
current circuit-analysis wheatstone-bridge nodal-analysis
current circuit-analysis wheatstone-bridge nodal-analysis
New contributor
New contributor
edited 2 days ago
Elliot Alderson
4,7641918
4,7641918
New contributor
asked 2 days ago
Feels awesome
294
294
New contributor
New contributor
3
this question was at first asked in physics stack exchange by me but it was unfortunately put on hold. link of first question -- physics.stackexchange.com/questions/450822/…
– Feels awesome
2 days ago
2
Didn't we just go through all this, like a day ago?
– jonk
2 days ago
1
that was a kind guy who posted my question again as the one that i posted was put on hold of some unknown reason . as the qs he posted has some errors I posted it again .
– Feels awesome
2 days ago
3
Possible duplicate of What's wrong with this Wheatstone bridge?
– fhlb
2 days ago
ya I have posted it again to get better ans
– Feels awesome
2 days ago
|
show 1 more comment
3
this question was at first asked in physics stack exchange by me but it was unfortunately put on hold. link of first question -- physics.stackexchange.com/questions/450822/…
– Feels awesome
2 days ago
2
Didn't we just go through all this, like a day ago?
– jonk
2 days ago
1
that was a kind guy who posted my question again as the one that i posted was put on hold of some unknown reason . as the qs he posted has some errors I posted it again .
– Feels awesome
2 days ago
3
Possible duplicate of What's wrong with this Wheatstone bridge?
– fhlb
2 days ago
ya I have posted it again to get better ans
– Feels awesome
2 days ago
3
3
this question was at first asked in physics stack exchange by me but it was unfortunately put on hold. link of first question -- physics.stackexchange.com/questions/450822/…
– Feels awesome
2 days ago
this question was at first asked in physics stack exchange by me but it was unfortunately put on hold. link of first question -- physics.stackexchange.com/questions/450822/…
– Feels awesome
2 days ago
2
2
Didn't we just go through all this, like a day ago?
– jonk
2 days ago
Didn't we just go through all this, like a day ago?
– jonk
2 days ago
1
1
that was a kind guy who posted my question again as the one that i posted was put on hold of some unknown reason . as the qs he posted has some errors I posted it again .
– Feels awesome
2 days ago
that was a kind guy who posted my question again as the one that i posted was put on hold of some unknown reason . as the qs he posted has some errors I posted it again .
– Feels awesome
2 days ago
3
3
Possible duplicate of What's wrong with this Wheatstone bridge?
– fhlb
2 days ago
Possible duplicate of What's wrong with this Wheatstone bridge?
– fhlb
2 days ago
ya I have posted it again to get better ans
– Feels awesome
2 days ago
ya I have posted it again to get better ans
– Feels awesome
2 days ago
|
show 1 more comment
3 Answers
3
active
oldest
votes
You start with a primitive circuit, and then apply a series of re-configurations, becoming progressively more sophisticated, until you arrive at the final level of sophistication - a single 4 ohm resistor and a source.
Along the way, the currents and voltages in/at the various conductors and nodes that you introduce/remove, change. It's not surprising. There are an infinite number of ways of transforming a single resistor into a bridge.
In 'simplifying' the original primitive bridge circuit you lose information that you cannot recover. You cannot rediscover the bridge if all you have to work on is a 36 volt source and a 4 ohm resistor.
so u that mean re-configuring the circuit is the mistake.
– Feels awesome
2 days ago
Not at all. It depends what you're doing it for. You lose the detail of the circuit when you simplify, and you can't go on a random path and expect to recreate it.
– Chu
2 days ago
now it makes sense . 👍
– Feels awesome
2 days ago
add a comment |
Analyzing the circuit by using only Ohm's law and equivalent resistance we can calculate the current passing through each wire in the circuit:
It is clear that there's a 3A current going from node C to D.
Now if you switched R3 and R4 positions. then indeed no current will flow through the mid wire but the thing is, the current passing through the wire is not i. call it i2 as the circuit has indeed changed.
i agree with ur point . but we know that the first circuit(in my qs) is equivalent to the second circuit(in my qs) . so there is most probably no mistake the rearrangement .so where is the mistake ?
– Feels awesome
2 days ago
node C and node D dissappeared. so it's not the same circuit.
– fhlb
2 days ago
no the node c and D has not disappeared it is present in the last circuit
– Feels awesome
2 days ago
2 new nodes appeared but C and D are clearly note there. C by definition is the node joining R2,R4 and node D
– fhlb
2 days ago
thats fine but what is the error in my rearrangement . ?
– Feels awesome
2 days ago
|
show 2 more comments
THe upper cct has a bridge current of 12V/4Ω=3A but a total current of 36V /4.5Ω = 8A from (9//9=4.5Ω)
The lower circuit has a bridge current of 0A yet still a total current of 8A.
simulate this circuit – Schematic created using CircuitLab
These are not the same circuits.
but hey both are same circuits ,right ?.and we still get two different values of current hiw is it possible?
– Feels awesome
2 days ago
THey total current is the same but not the same circuits with the R's swapped and bridged. Once side is 12V the other 24V
– Tony EE rocketscientist
2 days ago
and the upper circuit has the current of 3 amp in the bridge .
– Feels awesome
2 days ago
typo...........
– Tony EE rocketscientist
2 days ago
1
why arent they equivalent circuits ? I think , I have only rearranged them without any mistakes
– Feels awesome
2 days ago
|
show 12 more comments
Your Answer
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3 Answers
3
active
oldest
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3 Answers
3
active
oldest
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votes
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You start with a primitive circuit, and then apply a series of re-configurations, becoming progressively more sophisticated, until you arrive at the final level of sophistication - a single 4 ohm resistor and a source.
Along the way, the currents and voltages in/at the various conductors and nodes that you introduce/remove, change. It's not surprising. There are an infinite number of ways of transforming a single resistor into a bridge.
In 'simplifying' the original primitive bridge circuit you lose information that you cannot recover. You cannot rediscover the bridge if all you have to work on is a 36 volt source and a 4 ohm resistor.
so u that mean re-configuring the circuit is the mistake.
– Feels awesome
2 days ago
Not at all. It depends what you're doing it for. You lose the detail of the circuit when you simplify, and you can't go on a random path and expect to recreate it.
– Chu
2 days ago
now it makes sense . 👍
– Feels awesome
2 days ago
add a comment |
You start with a primitive circuit, and then apply a series of re-configurations, becoming progressively more sophisticated, until you arrive at the final level of sophistication - a single 4 ohm resistor and a source.
Along the way, the currents and voltages in/at the various conductors and nodes that you introduce/remove, change. It's not surprising. There are an infinite number of ways of transforming a single resistor into a bridge.
In 'simplifying' the original primitive bridge circuit you lose information that you cannot recover. You cannot rediscover the bridge if all you have to work on is a 36 volt source and a 4 ohm resistor.
so u that mean re-configuring the circuit is the mistake.
– Feels awesome
2 days ago
Not at all. It depends what you're doing it for. You lose the detail of the circuit when you simplify, and you can't go on a random path and expect to recreate it.
– Chu
2 days ago
now it makes sense . 👍
– Feels awesome
2 days ago
add a comment |
You start with a primitive circuit, and then apply a series of re-configurations, becoming progressively more sophisticated, until you arrive at the final level of sophistication - a single 4 ohm resistor and a source.
Along the way, the currents and voltages in/at the various conductors and nodes that you introduce/remove, change. It's not surprising. There are an infinite number of ways of transforming a single resistor into a bridge.
In 'simplifying' the original primitive bridge circuit you lose information that you cannot recover. You cannot rediscover the bridge if all you have to work on is a 36 volt source and a 4 ohm resistor.
You start with a primitive circuit, and then apply a series of re-configurations, becoming progressively more sophisticated, until you arrive at the final level of sophistication - a single 4 ohm resistor and a source.
Along the way, the currents and voltages in/at the various conductors and nodes that you introduce/remove, change. It's not surprising. There are an infinite number of ways of transforming a single resistor into a bridge.
In 'simplifying' the original primitive bridge circuit you lose information that you cannot recover. You cannot rediscover the bridge if all you have to work on is a 36 volt source and a 4 ohm resistor.
edited 2 days ago
answered 2 days ago
Chu
5,1352611
5,1352611
so u that mean re-configuring the circuit is the mistake.
– Feels awesome
2 days ago
Not at all. It depends what you're doing it for. You lose the detail of the circuit when you simplify, and you can't go on a random path and expect to recreate it.
– Chu
2 days ago
now it makes sense . 👍
– Feels awesome
2 days ago
add a comment |
so u that mean re-configuring the circuit is the mistake.
– Feels awesome
2 days ago
Not at all. It depends what you're doing it for. You lose the detail of the circuit when you simplify, and you can't go on a random path and expect to recreate it.
– Chu
2 days ago
now it makes sense . 👍
– Feels awesome
2 days ago
so u that mean re-configuring the circuit is the mistake.
– Feels awesome
2 days ago
so u that mean re-configuring the circuit is the mistake.
– Feels awesome
2 days ago
Not at all. It depends what you're doing it for. You lose the detail of the circuit when you simplify, and you can't go on a random path and expect to recreate it.
– Chu
2 days ago
Not at all. It depends what you're doing it for. You lose the detail of the circuit when you simplify, and you can't go on a random path and expect to recreate it.
– Chu
2 days ago
now it makes sense . 👍
– Feels awesome
2 days ago
now it makes sense . 👍
– Feels awesome
2 days ago
add a comment |
Analyzing the circuit by using only Ohm's law and equivalent resistance we can calculate the current passing through each wire in the circuit:
It is clear that there's a 3A current going from node C to D.
Now if you switched R3 and R4 positions. then indeed no current will flow through the mid wire but the thing is, the current passing through the wire is not i. call it i2 as the circuit has indeed changed.
i agree with ur point . but we know that the first circuit(in my qs) is equivalent to the second circuit(in my qs) . so there is most probably no mistake the rearrangement .so where is the mistake ?
– Feels awesome
2 days ago
node C and node D dissappeared. so it's not the same circuit.
– fhlb
2 days ago
no the node c and D has not disappeared it is present in the last circuit
– Feels awesome
2 days ago
2 new nodes appeared but C and D are clearly note there. C by definition is the node joining R2,R4 and node D
– fhlb
2 days ago
thats fine but what is the error in my rearrangement . ?
– Feels awesome
2 days ago
|
show 2 more comments
Analyzing the circuit by using only Ohm's law and equivalent resistance we can calculate the current passing through each wire in the circuit:
It is clear that there's a 3A current going from node C to D.
Now if you switched R3 and R4 positions. then indeed no current will flow through the mid wire but the thing is, the current passing through the wire is not i. call it i2 as the circuit has indeed changed.
i agree with ur point . but we know that the first circuit(in my qs) is equivalent to the second circuit(in my qs) . so there is most probably no mistake the rearrangement .so where is the mistake ?
– Feels awesome
2 days ago
node C and node D dissappeared. so it's not the same circuit.
– fhlb
2 days ago
no the node c and D has not disappeared it is present in the last circuit
– Feels awesome
2 days ago
2 new nodes appeared but C and D are clearly note there. C by definition is the node joining R2,R4 and node D
– fhlb
2 days ago
thats fine but what is the error in my rearrangement . ?
– Feels awesome
2 days ago
|
show 2 more comments
Analyzing the circuit by using only Ohm's law and equivalent resistance we can calculate the current passing through each wire in the circuit:
It is clear that there's a 3A current going from node C to D.
Now if you switched R3 and R4 positions. then indeed no current will flow through the mid wire but the thing is, the current passing through the wire is not i. call it i2 as the circuit has indeed changed.
Analyzing the circuit by using only Ohm's law and equivalent resistance we can calculate the current passing through each wire in the circuit:
It is clear that there's a 3A current going from node C to D.
Now if you switched R3 and R4 positions. then indeed no current will flow through the mid wire but the thing is, the current passing through the wire is not i. call it i2 as the circuit has indeed changed.
answered 2 days ago
fhlb
799721
799721
i agree with ur point . but we know that the first circuit(in my qs) is equivalent to the second circuit(in my qs) . so there is most probably no mistake the rearrangement .so where is the mistake ?
– Feels awesome
2 days ago
node C and node D dissappeared. so it's not the same circuit.
– fhlb
2 days ago
no the node c and D has not disappeared it is present in the last circuit
– Feels awesome
2 days ago
2 new nodes appeared but C and D are clearly note there. C by definition is the node joining R2,R4 and node D
– fhlb
2 days ago
thats fine but what is the error in my rearrangement . ?
– Feels awesome
2 days ago
|
show 2 more comments
i agree with ur point . but we know that the first circuit(in my qs) is equivalent to the second circuit(in my qs) . so there is most probably no mistake the rearrangement .so where is the mistake ?
– Feels awesome
2 days ago
node C and node D dissappeared. so it's not the same circuit.
– fhlb
2 days ago
no the node c and D has not disappeared it is present in the last circuit
– Feels awesome
2 days ago
2 new nodes appeared but C and D are clearly note there. C by definition is the node joining R2,R4 and node D
– fhlb
2 days ago
thats fine but what is the error in my rearrangement . ?
– Feels awesome
2 days ago
i agree with ur point . but we know that the first circuit(in my qs) is equivalent to the second circuit(in my qs) . so there is most probably no mistake the rearrangement .so where is the mistake ?
– Feels awesome
2 days ago
i agree with ur point . but we know that the first circuit(in my qs) is equivalent to the second circuit(in my qs) . so there is most probably no mistake the rearrangement .so where is the mistake ?
– Feels awesome
2 days ago
node C and node D dissappeared. so it's not the same circuit.
– fhlb
2 days ago
node C and node D dissappeared. so it's not the same circuit.
– fhlb
2 days ago
no the node c and D has not disappeared it is present in the last circuit
– Feels awesome
2 days ago
no the node c and D has not disappeared it is present in the last circuit
– Feels awesome
2 days ago
2 new nodes appeared but C and D are clearly note there. C by definition is the node joining R2,R4 and node D
– fhlb
2 days ago
2 new nodes appeared but C and D are clearly note there. C by definition is the node joining R2,R4 and node D
– fhlb
2 days ago
thats fine but what is the error in my rearrangement . ?
– Feels awesome
2 days ago
thats fine but what is the error in my rearrangement . ?
– Feels awesome
2 days ago
|
show 2 more comments
THe upper cct has a bridge current of 12V/4Ω=3A but a total current of 36V /4.5Ω = 8A from (9//9=4.5Ω)
The lower circuit has a bridge current of 0A yet still a total current of 8A.
simulate this circuit – Schematic created using CircuitLab
These are not the same circuits.
but hey both are same circuits ,right ?.and we still get two different values of current hiw is it possible?
– Feels awesome
2 days ago
THey total current is the same but not the same circuits with the R's swapped and bridged. Once side is 12V the other 24V
– Tony EE rocketscientist
2 days ago
and the upper circuit has the current of 3 amp in the bridge .
– Feels awesome
2 days ago
typo...........
– Tony EE rocketscientist
2 days ago
1
why arent they equivalent circuits ? I think , I have only rearranged them without any mistakes
– Feels awesome
2 days ago
|
show 12 more comments
THe upper cct has a bridge current of 12V/4Ω=3A but a total current of 36V /4.5Ω = 8A from (9//9=4.5Ω)
The lower circuit has a bridge current of 0A yet still a total current of 8A.
simulate this circuit – Schematic created using CircuitLab
These are not the same circuits.
but hey both are same circuits ,right ?.and we still get two different values of current hiw is it possible?
– Feels awesome
2 days ago
THey total current is the same but not the same circuits with the R's swapped and bridged. Once side is 12V the other 24V
– Tony EE rocketscientist
2 days ago
and the upper circuit has the current of 3 amp in the bridge .
– Feels awesome
2 days ago
typo...........
– Tony EE rocketscientist
2 days ago
1
why arent they equivalent circuits ? I think , I have only rearranged them without any mistakes
– Feels awesome
2 days ago
|
show 12 more comments
THe upper cct has a bridge current of 12V/4Ω=3A but a total current of 36V /4.5Ω = 8A from (9//9=4.5Ω)
The lower circuit has a bridge current of 0A yet still a total current of 8A.
simulate this circuit – Schematic created using CircuitLab
These are not the same circuits.
THe upper cct has a bridge current of 12V/4Ω=3A but a total current of 36V /4.5Ω = 8A from (9//9=4.5Ω)
The lower circuit has a bridge current of 0A yet still a total current of 8A.
simulate this circuit – Schematic created using CircuitLab
These are not the same circuits.
edited 2 days ago
answered 2 days ago
Tony EE rocketscientist
62k22193
62k22193
but hey both are same circuits ,right ?.and we still get two different values of current hiw is it possible?
– Feels awesome
2 days ago
THey total current is the same but not the same circuits with the R's swapped and bridged. Once side is 12V the other 24V
– Tony EE rocketscientist
2 days ago
and the upper circuit has the current of 3 amp in the bridge .
– Feels awesome
2 days ago
typo...........
– Tony EE rocketscientist
2 days ago
1
why arent they equivalent circuits ? I think , I have only rearranged them without any mistakes
– Feels awesome
2 days ago
|
show 12 more comments
but hey both are same circuits ,right ?.and we still get two different values of current hiw is it possible?
– Feels awesome
2 days ago
THey total current is the same but not the same circuits with the R's swapped and bridged. Once side is 12V the other 24V
– Tony EE rocketscientist
2 days ago
and the upper circuit has the current of 3 amp in the bridge .
– Feels awesome
2 days ago
typo...........
– Tony EE rocketscientist
2 days ago
1
why arent they equivalent circuits ? I think , I have only rearranged them without any mistakes
– Feels awesome
2 days ago
but hey both are same circuits ,right ?.and we still get two different values of current hiw is it possible?
– Feels awesome
2 days ago
but hey both are same circuits ,right ?.and we still get two different values of current hiw is it possible?
– Feels awesome
2 days ago
THey total current is the same but not the same circuits with the R's swapped and bridged. Once side is 12V the other 24V
– Tony EE rocketscientist
2 days ago
THey total current is the same but not the same circuits with the R's swapped and bridged. Once side is 12V the other 24V
– Tony EE rocketscientist
2 days ago
and the upper circuit has the current of 3 amp in the bridge .
– Feels awesome
2 days ago
and the upper circuit has the current of 3 amp in the bridge .
– Feels awesome
2 days ago
typo...........
– Tony EE rocketscientist
2 days ago
typo...........
– Tony EE rocketscientist
2 days ago
1
1
why arent they equivalent circuits ? I think , I have only rearranged them without any mistakes
– Feels awesome
2 days ago
why arent they equivalent circuits ? I think , I have only rearranged them without any mistakes
– Feels awesome
2 days ago
|
show 12 more comments
Feels awesome is a new contributor. Be nice, and check out our Code of Conduct.
Feels awesome is a new contributor. Be nice, and check out our Code of Conduct.
Feels awesome is a new contributor. Be nice, and check out our Code of Conduct.
Feels awesome is a new contributor. Be nice, and check out our Code of Conduct.
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3
this question was at first asked in physics stack exchange by me but it was unfortunately put on hold. link of first question -- physics.stackexchange.com/questions/450822/…
– Feels awesome
2 days ago
2
Didn't we just go through all this, like a day ago?
– jonk
2 days ago
1
that was a kind guy who posted my question again as the one that i posted was put on hold of some unknown reason . as the qs he posted has some errors I posted it again .
– Feels awesome
2 days ago
3
Possible duplicate of What's wrong with this Wheatstone bridge?
– fhlb
2 days ago
ya I have posted it again to get better ans
– Feels awesome
2 days ago