Question

Draw a labelled circuit diagram showing three resistors R₁, R₂ and R₃ connected in series with a battery (E), a rheostat (Rh), a plug key (K) and an ammeter (A) using standard circuit symbol. Use this circuit to show that the same current flows through every part of the circuit. List two precautions you would observe while performing the experiment.

Answer 1

Aim: Same current flows through every part of the above circuit. 

Procedure: Connect ammeters, ‘A’₁ between B and C, and ‘A₂’ between D and E. Adjust the sliding contact of the rheostat initially for a small current. Note all the ammeter readings. These reading give us current flowing through the resistors R₁, R₂ and R₃ The current in the circuit is now increased by changing the position of sliding contact J’ of the rheostat. Note all the ammeter readings each time. 

Conclusion: Same reading of all the ammeter in each observation concluded that same current flows through every part of the circuit.

Precautions: All the connection should be tight and properly connected as per circuit diagram. The positive terminal of the ammeter and voltmeter must be connected to the positive terminal of the battery or battery eliminator.