Your question is incomplete, but it sounds like you might be asking what would happen if you short circuit an ideal voltage source.
The answer is, you can't ask that question. An ideal voltage source is not a real thing. It is a useful part of a theory that we use to describe electronic circuits. But the circuit I just described, a shorted ideal voltage source, is a circuit that can not physically exist.
Real electric power supplies often are designed to approximate an ideal voltage source. But a more accurate model of a real power supply would be constructed from an ideal voltage source plus other ideal components that would limit the current in the case of a short circuit. In the more accurate model, both voltage and current would be well defined, finite numbers everywhere.
Another way of looking at it: The voltage across the terminals of an ideal voltage source, by definition, is not zero. The voltage across the terminals of a zero-ohm resistor, by Ohm's law, must be zero. If you connect them in parallel, the voltage across both components, by Kirchoff's laws, must be the same.
What does it mean when a theory says that it is impossible for two values to be different, and the same theory says that it is impossible for them to be the same? It means that you have asked a question that the theory can not answer.