1. Draw a labelled circuit diagram showing three resistors R., and R, connected in series with a battery
(E a theostat(Rh), a plug key (K) and an ammeter (A) using standard circuit symbols. Use this circuit to
show that the same current flows through every of the circuit List two precautions you would observe
while performing the experiment
de of mil length and have equal resistances. If the resistivity of Ais more than that
Answers
Explanation:
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Answer:
The equivalent resistance of the circuit
R = R1 +R2 +R3+Rh
As these are connected in series
Ammeter is used measure current in the circuit.
Battery E provides potential difference across the positive and negative terminal because of which current flows in the circuit.
Rheostat is used to vary resistance. With change in resistance, current would vary as same amount of current would flow throughout this series circuit.
When key is closed, circuit is complete. Current:
From ohm's law:
E = I R
E = I (R1 +R2 +R3+Rh)
With increase in resistance offered by rheostat, the current would decrease.
Two precautions that must be taken while performing this experiment:
1. Ammeter must be placed in series in the circuit.
2. Key must be closed while taking the readings of the ammeter.
Answer:
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