1. Connect an ammeter between and and note down the current.
2. Repeat the same by connecting it between , and then and
3. You will find that all the notings are same. hence, same current flows throughout a circuit with service connection.
(i) The two restores are in parallel the resultant resistance will be
The circuit could be drawn as
Let's assume current i is flowing in the circuit
(ii) The current in both ammetur and will be same because they are connected in series
Hence difference between reading will be zero.