Resistance per cm of a given wire- Physics practical
Apparatus required
- Battery Eliminator 2 or 3 Amps
- One way plug key
- Rheostat 2.3 A, 56 Ohms
- Ammeter 0 to 3 A
- Resistance coil 100 cm or any desired length
- Voltmeter 0 to 3 V
- Resistance wire (alternative)
- Connecting wire (D.C.C)
Resistance per cm of a wire-Circuit Diagram
Resistance per cm of a wire:Experimental setup
Resistance per cm of a wire-Procedure
- Connect the ammeter in series with the circuit wire and the voltmeter in parallel with the wire.
- Note the zero error of the meters.
- Calculate the least count of the meters.
- Switch on the circuit.
- Set the rheostat to a particular position and record the readings of the ammeter and voltmeter.
- Repeat steps 5 and 6 for different settings of the rheostat.
- Tabulate the readings.
- Calculate the resistance of the wire using the formula R=V/I
- Resistance per cm is calculated from the above value.
Least count of an ammeter
Least count of a voltmeter
Resistance per cm of a wire:Tabular Column & Observation
Mapping potential-Graphing voltage against current
Unveiling wire resistance-A practical exploration by experimental and graphical method
RESULT
The length of the given wire is 100 cm
The resistance per cm of the given wire is 0.03 Ohms
LINKS TO OTHER EXPERIMENTS:
Comparison of emf of two cells using potentiometer
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