How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery ?

Explanation

(i) Join the three resistors of different values in series. (ii) Connect them with battery, an ammeter and plug key. (iii) Plug the key and note the ammeter reading. (iv) Change the position of ammeter to anywhere in between the resistors and note the ammeter reading each time. (v) The ammeter reading will remain same everytime. Therefore when resistors are connected in series same current flows through all resistors, when it is connected to a battery.
Suppose the experimental set up comprises of three resistors `R_(1), R_(2)` and `R_(3)` of three different values which are connected in series with an ammeter, key an d a battery of known voltage is given as below

The key K is closed and the ammeter reading is recorded. Now, the position of ammeter is changed to anywhere in between the resistors. The ammeter reading is recorded each time. It is found that there is an identical reading each time, which shows that same current flows through every part of the circuit containing three resistances in series connected to a battery.