If there are several sources acting simultaneously in an electrical circuit, then the current through any branch of the circuit is summation of currents which would flow through the branch for each source keeping all other sources dead.Let us understand the statement.Here, two 1.5 Volt batteries present in the circuit. At this condition, the current through 1 ohm resistance is 1.2 ampere.The ammeter indicates this value in the above picture.Now, we replace the left side battery by a short circui