how can be ohm's law verified experimentally
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Greetings,
The answer to your question is given below ^
_____________________________________________________________
Experimental Verification of Ohm's law-(Refer the diagram)
Set up: (Don't spend too much time reading this, its just for understanding)
The rheostat (Rh) , key (k), ammeter (A) and resistance wire (R)
are connected in series with the battery (B), taking care that the +ve marked terminal of ammeter (A) is towards the positive terminal of the battery. The voltmeter (V) is then connect in parallel across the resistance wire (R) keeping its +ve marked terminal towards the positive terminal of the battery.
The battery (B) sends current in the circuit. The current in the circuit is controlled by a rheostat (Rh) and an ammeter (A) measures it. The key (K) is used to make and break the circuit. The wire R (say, a nichrome wire) is the unknown resistance. The voltmeter (V) measures the potential difference across the ends of the resistance wire (R).
Procedure: (This is v. important. Read carefully)
As the key (K) is closed, current flows in the circuit. The rheostat (Rh) is adjusted to get the minimum (non-zero) reading in the ammeter (A) and voltmeter (V). The ammeter and voltmeter readings of current (I) are noted. The sliding terminal of the rheostat is then moved to increase the current gradually and each time the value of current (I) flowing in the circuit and potential difference (V) across the resistance wire (R) are recorded by noting the readings of ammeter (A) and voltmeter (V) respectively. In this way, different sets of values of I and V are recorded in a table. Then for each sets of values of I & V, the ratio V/I is calculated using the formula (R=V/I).
From the calculations of the different sets of values of V/I, it is observed that the ration V/I is almost constant, the average value of which gives the resistance R of the wire.
Therefore, we infer form this experiment that:
The current flowing in a conductor is directly proportional to the potential difference across its ends provided the physical conditions and temperature of the conductor remain constant.
_____________________________________________________________
PS: Enjoy;)
The answer to your question is given below ^
_____________________________________________________________
Experimental Verification of Ohm's law-(Refer the diagram)
Set up: (Don't spend too much time reading this, its just for understanding)
The rheostat (Rh) , key (k), ammeter (A) and resistance wire (R)
are connected in series with the battery (B), taking care that the +ve marked terminal of ammeter (A) is towards the positive terminal of the battery. The voltmeter (V) is then connect in parallel across the resistance wire (R) keeping its +ve marked terminal towards the positive terminal of the battery.
The battery (B) sends current in the circuit. The current in the circuit is controlled by a rheostat (Rh) and an ammeter (A) measures it. The key (K) is used to make and break the circuit. The wire R (say, a nichrome wire) is the unknown resistance. The voltmeter (V) measures the potential difference across the ends of the resistance wire (R).
Procedure: (This is v. important. Read carefully)
As the key (K) is closed, current flows in the circuit. The rheostat (Rh) is adjusted to get the minimum (non-zero) reading in the ammeter (A) and voltmeter (V). The ammeter and voltmeter readings of current (I) are noted. The sliding terminal of the rheostat is then moved to increase the current gradually and each time the value of current (I) flowing in the circuit and potential difference (V) across the resistance wire (R) are recorded by noting the readings of ammeter (A) and voltmeter (V) respectively. In this way, different sets of values of I and V are recorded in a table. Then for each sets of values of I & V, the ratio V/I is calculated using the formula (R=V/I).
From the calculations of the different sets of values of V/I, it is observed that the ration V/I is almost constant, the average value of which gives the resistance R of the wire.
Therefore, we infer form this experiment that:
The current flowing in a conductor is directly proportional to the potential difference across its ends provided the physical conditions and temperature of the conductor remain constant.
_____________________________________________________________
PS: Enjoy;)
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