Answer:
This is due to ohm’s law which states “The current flowing through a conductor is directly proportional to the potential difference across it ends and is inversely proportional to it’s resistance, provided the temperature and other physical conditions remains constant”
OR
In simple terms V(voltage)=I(current)*R(resistance).
Therefore I=V/R
As per your stated question I=10V/5 ohms=2 amperes
If it contains various combination of resistors it’s a different story but this law is applicable in every aspect of basic electronic and electrical problems
