Question

why is current same in series connection
​

Answer 1

Explanation:

In a series circuit, there is one node between each circuit element. That means that all of the current flowing into the node must also flow out of the node (again, all the charges going into the node must also come out of the node). That is why current is the same through a series circuit.

Answer 2

A series circuit have only one conducting path and then, for reasons related to conservation principle of total charge, the total current at input is in every instant equal to the total current at the output.