How to calculate current and voltage when resistance, time and power are known

How to calculate current and voltage when resistance, time and power are known


electric current:
I = root (P / R)
Voltage:
U = root (P × R)
Power consumption:
KW/h=P×t/1000



The resistance of a superconductor is zero. According to Ohm's law, the current flowing through it should be zero. Why not? It's against Ohm's law,
Is 1 divided by 0 infinite?


Ohm's law is to explain the conventional circuit, superconductivity itself is an abnormal phenomenon, not applicable to Ohm's law