- #1
PainterGuy
- 940
- 70
hello fine people,
ohm law is V=IR. suppose V is a constant value, as say 5. then it is I=5/R. when R is zero current is infinite. me thinks this is case with superconductors. me have been telled that limit of I=5/R does not exist. what did it mean in this real world problem? will this mean R=0 is not possible, but it is as in superconductor. will this mean ohm law is only valid under certain condition? will it mean as R tends toward 0, the conductor stop behaving as a ohmic conductor?
this is sub-question:--- in case of superconductor if you have applied voltage to it once the current will b there as long as something do not take it out. which means as long as current is not usedd to do some work.. me have seen a picture magnet flying over a very cold superconductor.. some my friend was saying current is doing work to keep that magnet flying at fixed position. but me thinks this is not work from physics view. if me stands holding a bucket of water me not doing any physics work.
this is another sub-question:--- me once read to achieve zero kelvin is impossible because atoms can not never stop moving around completely. which means there is always some small movement of atoms and this is temperature. and if there is always some atomic motion, then itt is impossible to have zero resistance because some electrons will struggle against those moving atoms.
please show me the light. every help is appreciated. cheers
edit:--- please don't use quantum things and complex math formulas. take care
ohm law is V=IR. suppose V is a constant value, as say 5. then it is I=5/R. when R is zero current is infinite. me thinks this is case with superconductors. me have been telled that limit of I=5/R does not exist. what did it mean in this real world problem? will this mean R=0 is not possible, but it is as in superconductor. will this mean ohm law is only valid under certain condition? will it mean as R tends toward 0, the conductor stop behaving as a ohmic conductor?
this is sub-question:--- in case of superconductor if you have applied voltage to it once the current will b there as long as something do not take it out. which means as long as current is not usedd to do some work.. me have seen a picture magnet flying over a very cold superconductor.. some my friend was saying current is doing work to keep that magnet flying at fixed position. but me thinks this is not work from physics view. if me stands holding a bucket of water me not doing any physics work.
this is another sub-question:--- me once read to achieve zero kelvin is impossible because atoms can not never stop moving around completely. which means there is always some small movement of atoms and this is temperature. and if there is always some atomic motion, then itt is impossible to have zero resistance because some electrons will struggle against those moving atoms.
please show me the light. every help is appreciated. cheers
edit:--- please don't use quantum things and complex math formulas. take care