How to calculate the current of superconductor? I = u / R. r = 0, isn't the current infinite?

How to calculate the current of superconductor? I = u / R. r = 0, isn't the current infinite?

Ohm's law is just a macroscopic universal effect. It tells you that the current is inversely proportional to the voltage. In superconductors, the current is generated by electromagnetic induction instead of the current generated by adding voltage to the two ends. The current in superconductors does not work, so you can think that there is no voltage at any two ends

Current in superconductors
We know that superconductors have critical current - ic assumes that there is no critical current, that is, the current in a superconductor reaches infinity in a closed circuit. According to the Manas effect, its internal magnetic induction is still zero, but will its strong current cause the external magnetic induction to increase, exceed its HC and destroy its superconducting state?

IC and HC are closely related. The larger IC of superconductor, the larger HC

If the resistance in superconductor is zero, we can know r = u / I. how can we calculate the resistance to zero?

I thought about this problem when I was in the second grade of junior high school. You should know that Ohm's law is an experimental formula. This experimental formula is applicable only when the circuit elements completely convert the electric energy into internal energy (such as resistance, light bulb, but can't calculate the electric energy of motor). You should know that superconductors can't convert the electric energy into internal energy, and Ohm's law is not applicable here
Again, Ohm's law is only an experimental formula, and the amount of calculation is only very rough

Is zero resistance equal to no resistance? Superconductors and insulators mean zero resistance or no resistance?

Resistance is zero, of course, equal to no resistance, but resistance is zero, that is impossible. Superconductors can only say no resistance, but not zero resistance. Because no resistance is a relatively negligible statement. So superconductors also because of its resistance, compared with various metal resistance, it is too small, so for nature and