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Do voltage-limiting resistors exist?
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I see sometimes that resistors are specified as current-limiting resistors, so I decided to see if voltage-limiting ones exist. When I do a search though, I don't see anything mentioning voltage-limiting resistors.
resistors
asked Aug 16 at 20:43
christophrrb
212
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up vote
3
down vote
favorite
I see sometimes that resistors are specified as current-limiting resistors, so I decided to see if voltage-limiting ones exist. When I do a search though, I don't see anything mentioning voltage-limiting resistors.
resistors
asked Aug 16 at 20:43
christophrrb
212
6
"current-limiting" is not a type of a resistor, it is a function of the resistor in a particular circuit.
– Maple
Aug 16 at 22:17
1
I can imagine circuits where a resistor would limit voltage.
– immibis
Aug 17 at 1:07
add a comment |Â
up vote
3
down vote
favorite
up vote
3
down vote
favorite
I see sometimes that resistors are specified as current-limiting resistors, so I decided to see if voltage-limiting ones exist. When I do a search though, I don't see anything mentioning voltage-limiting resistors.
resistors
asked Aug 16 at 20:43
christophrrb
212
I see sometimes that resistors are specified as current-limiting resistors, so I decided to see if voltage-limiting ones exist. When I do a search though, I don't see anything mentioning voltage-limiting resistors.
resistors
asked Aug 16 at 20:43
christophrrb
212
asked Aug 16 at 20:43
christophrrb
212
asked Aug 16 at 20:43
christophrrb
212
asked Aug 16 at 20:43
christophrrb
212
212
6
"current-limiting" is not a type of a resistor, it is a function of the resistor in a particular circuit.
– Maple
Aug 16 at 22:17
1
I can imagine circuits where a resistor would limit voltage.
– immibis
Aug 17 at 1:07
add a comment |Â
6
"current-limiting" is not a type of a resistor, it is a function of the resistor in a particular circuit.
– Maple
Aug 16 at 22:17
1
I can imagine circuits where a resistor would limit voltage.
– immibis
Aug 17 at 1:07
6
6
"current-limiting" is not a type of a resistor, it is a function of the resistor in a particular circuit.
– Maple
Aug 16 at 22:17
"current-limiting" is not a type of a resistor, it is a function of the resistor in a particular circuit.
– Maple
Aug 16 at 22:17
1
1
I can imagine circuits where a resistor would limit voltage.
– immibis
Aug 17 at 1:07
I can imagine circuits where a resistor would limit voltage.
– immibis
Aug 17 at 1:07
add a comment |Â
2 Answers
2
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oldest
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up vote
12
down vote
accepted
A voltage source is theoretically capable of supplying an infinite current into a short circuit hence if a series resistor is used then that short circuit current becomes amps or milliamps rather than infinite amps.
A current source, on the other hand, will not be affected by a series resistor at all - it will continue to produce whatever voltage is needed into an "open circuit" resorting to making a sustained electrical arc to create a conductive path if necessary. In these circumstances a parallel resistor will restrict the open circuit voltage because it will conduct the current back to the other terminal of the current source.
So, in short, a resistor can be a voltage limiting AND a current limiting device.
I see sometimes that resistors are specified as current-limiting
resistors
They are not specified as such i.e. a resistor isn't to be regarded as a current limiting resistor rather, it is the function it plays in the target circuit that may be described as "current limiting".
answered Aug 16 at 20:52
Andy aka
228k9167384
add a comment |Â
up vote
0
down vote
Example of Resistor used as current limiter and voltage divider (limiter)
simulate this circuit – Schematic created using CircuitLab
If you mean a polyfuse , then there is no voltage limiting R.
These have a large PTC ( positive tempco.) that rises in R exponentially past the holding current, causing a rapid rise in junction temperature from 120 to 140’C where current is limited by a design limit. These have a cold (25’C) resistance rating as well.
The opposite temperature characteristic is a large NTC which drops in R rapidly as it heats up. These are used as inrush current limiters called ICL’s and also have a cold and hot resistance ratings with corresponding current ratings.
Both are metal oxide components but with a different mix of conductive particles in a ceramic composition.
Voltage limiters are semiconductive such as; TVS, MOV, Zeners and diodes. These cannot substitute as a fixed R value but do have some high leakage resistance that changes with many factors such as temperature.
answered Aug 16 at 21:12
Tony EE rocketscientist
56.6k22081
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
12
down vote
accepted
A voltage source is theoretically capable of supplying an infinite current into a short circuit hence if a series resistor is used then that short circuit current becomes amps or milliamps rather than infinite amps.
A current source, on the other hand, will not be affected by a series resistor at all - it will continue to produce whatever voltage is needed into an "open circuit" resorting to making a sustained electrical arc to create a conductive path if necessary. In these circumstances a parallel resistor will restrict the open circuit voltage because it will conduct the current back to the other terminal of the current source.
So, in short, a resistor can be a voltage limiting AND a current limiting device.
I see sometimes that resistors are specified as current-limiting
resistors
They are not specified as such i.e. a resistor isn't to be regarded as a current limiting resistor rather, it is the function it plays in the target circuit that may be described as "current limiting".
answered Aug 16 at 20:52
Andy aka
228k9167384
add a comment |Â
up vote
12
down vote
accepted
A voltage source is theoretically capable of supplying an infinite current into a short circuit hence if a series resistor is used then that short circuit current becomes amps or milliamps rather than infinite amps.
A current source, on the other hand, will not be affected by a series resistor at all - it will continue to produce whatever voltage is needed into an "open circuit" resorting to making a sustained electrical arc to create a conductive path if necessary. In these circumstances a parallel resistor will restrict the open circuit voltage because it will conduct the current back to the other terminal of the current source.
So, in short, a resistor can be a voltage limiting AND a current limiting device.
I see sometimes that resistors are specified as current-limiting
resistors
They are not specified as such i.e. a resistor isn't to be regarded as a current limiting resistor rather, it is the function it plays in the target circuit that may be described as "current limiting".
answered Aug 16 at 20:52
Andy aka
228k9167384
add a comment |Â
up vote
12
down vote
accepted
up vote
12
down vote
accepted
A voltage source is theoretically capable of supplying an infinite current into a short circuit hence if a series resistor is used then that short circuit current becomes amps or milliamps rather than infinite amps.
A current source, on the other hand, will not be affected by a series resistor at all - it will continue to produce whatever voltage is needed into an "open circuit" resorting to making a sustained electrical arc to create a conductive path if necessary. In these circumstances a parallel resistor will restrict the open circuit voltage because it will conduct the current back to the other terminal of the current source.
So, in short, a resistor can be a voltage limiting AND a current limiting device.
I see sometimes that resistors are specified as current-limiting
resistors
They are not specified as such i.e. a resistor isn't to be regarded as a current limiting resistor rather, it is the function it plays in the target circuit that may be described as "current limiting".
answered Aug 16 at 20:52
Andy aka
228k9167384
A voltage source is theoretically capable of supplying an infinite current into a short circuit hence if a series resistor is used then that short circuit current becomes amps or milliamps rather than infinite amps.
A current source, on the other hand, will not be affected by a series resistor at all - it will continue to produce whatever voltage is needed into an "open circuit" resorting to making a sustained electrical arc to create a conductive path if necessary. In these circumstances a parallel resistor will restrict the open circuit voltage because it will conduct the current back to the other terminal of the current source.
So, in short, a resistor can be a voltage limiting AND a current limiting device.
I see sometimes that resistors are specified as current-limiting
resistors
They are not specified as such i.e. a resistor isn't to be regarded as a current limiting resistor rather, it is the function it plays in the target circuit that may be described as "current limiting".
answered Aug 16 at 20:52
Andy aka
228k9167384
answered Aug 16 at 20:52
Andy aka
228k9167384
answered Aug 16 at 20:52
Andy aka
228k9167384
answered Aug 16 at 20:52
Andy aka
228k9167384
228k9167384
add a comment |Â
add a comment |Â
up vote
0
down vote
Example of Resistor used as current limiter and voltage divider (limiter)
simulate this circuit – Schematic created using CircuitLab
If you mean a polyfuse , then there is no voltage limiting R.
These have a large PTC ( positive tempco.) that rises in R exponentially past the holding current, causing a rapid rise in junction temperature from 120 to 140’C where current is limited by a design limit. These have a cold (25’C) resistance rating as well.
The opposite temperature characteristic is a large NTC which drops in R rapidly as it heats up. These are used as inrush current limiters called ICL’s and also have a cold and hot resistance ratings with corresponding current ratings.
Both are metal oxide components but with a different mix of conductive particles in a ceramic composition.
Voltage limiters are semiconductive such as; TVS, MOV, Zeners and diodes. These cannot substitute as a fixed R value but do have some high leakage resistance that changes with many factors such as temperature.
answered Aug 16 at 21:12
Tony EE rocketscientist
56.6k22081
add a comment |Â
up vote
0
down vote
Example of Resistor used as current limiter and voltage divider (limiter)
simulate this circuit – Schematic created using CircuitLab
If you mean a polyfuse , then there is no voltage limiting R.
These have a large PTC ( positive tempco.) that rises in R exponentially past the holding current, causing a rapid rise in junction temperature from 120 to 140’C where current is limited by a design limit. These have a cold (25’C) resistance rating as well.
The opposite temperature characteristic is a large NTC which drops in R rapidly as it heats up. These are used as inrush current limiters called ICL’s and also have a cold and hot resistance ratings with corresponding current ratings.
Both are metal oxide components but with a different mix of conductive particles in a ceramic composition.
Voltage limiters are semiconductive such as; TVS, MOV, Zeners and diodes. These cannot substitute as a fixed R value but do have some high leakage resistance that changes with many factors such as temperature.
answered Aug 16 at 21:12
Tony EE rocketscientist
56.6k22081
add a comment |Â
up vote
0
down vote
up vote
0
down vote
Example of Resistor used as current limiter and voltage divider (limiter)
simulate this circuit – Schematic created using CircuitLab
If you mean a polyfuse , then there is no voltage limiting R.
These have a large PTC ( positive tempco.) that rises in R exponentially past the holding current, causing a rapid rise in junction temperature from 120 to 140’C where current is limited by a design limit. These have a cold (25’C) resistance rating as well.
The opposite temperature characteristic is a large NTC which drops in R rapidly as it heats up. These are used as inrush current limiters called ICL’s and also have a cold and hot resistance ratings with corresponding current ratings.
Both are metal oxide components but with a different mix of conductive particles in a ceramic composition.
Voltage limiters are semiconductive such as; TVS, MOV, Zeners and diodes. These cannot substitute as a fixed R value but do have some high leakage resistance that changes with many factors such as temperature.
answered Aug 16 at 21:12
Tony EE rocketscientist
56.6k22081
Example of Resistor used as current limiter and voltage divider (limiter)
simulate this circuit – Schematic created using CircuitLab
If you mean a polyfuse , then there is no voltage limiting R.
These have a large PTC ( positive tempco.) that rises in R exponentially past the holding current, causing a rapid rise in junction temperature from 120 to 140’C where current is limited by a design limit. These have a cold (25’C) resistance rating as well.
The opposite temperature characteristic is a large NTC which drops in R rapidly as it heats up. These are used as inrush current limiters called ICL’s and also have a cold and hot resistance ratings with corresponding current ratings.
Both are metal oxide components but with a different mix of conductive particles in a ceramic composition.
Voltage limiters are semiconductive such as; TVS, MOV, Zeners and diodes. These cannot substitute as a fixed R value but do have some high leakage resistance that changes with many factors such as temperature.
answered Aug 16 at 21:12
Tony EE rocketscientist
56.6k22081
edited Aug 17 at 20:47
answered Aug 16 at 21:12
Tony EE rocketscientist
56.6k22081
answered Aug 16 at 21:12
Tony EE rocketscientist
56.6k22081
answered Aug 16 at 21:12
Tony EE rocketscientist
56.6k22081
56.6k22081
add a comment |Â
add a comment |Â
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6
"current-limiting" is not a type of a resistor, it is a function of the resistor in a particular circuit.
– Maple
Aug 16 at 22:17
1
I can imagine circuits where a resistor would limit voltage.
– immibis
Aug 17 at 1:07