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Karan Singh
Karan Singh
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I was going through my physics laboratory manual. In the Ohm's Law Experiment, the book states a few precautions without any reasoning.

1.The wire whose resistance has to be determined should ideally be made up of alloys such as Manganin and not a metal. 2. A low resistance rheostat should be used.

Any reason why this is so?

Also the book says that the resistance wire must be wound on its self before it is wound on bobbin or reel to avoid induction effect.I did not understand this.

Thank You.

PS:I am connecting my sample resistance wire(with its length constant) and taking different values of V and I by altering the rheostat resistance.

I was going through my physics laboratory manual. In the Ohm's Law Experiment, the book states a few precautions without any reasoning.

1.The wire whose resistance has to be determined should ideally be made up of alloys such as Manganin and not a metal. 2. A low resistance rheostat should be used.

Any reason why this is so?

Also the book says that the resistance wire must be wound on its self before it is wound on bobbin or reel to avoid induction effect.I did not understand this.

Thank You.

I was going through my physics laboratory manual. In the Ohm's Law Experiment, the book states a few precautions without any reasoning.

1.The wire whose resistance has to be determined should ideally be made up of alloys such as Manganin and not a metal. 2. A low resistance rheostat should be used.

Any reason why this is so?

Also the book says that the resistance wire must be wound on its self before it is wound on bobbin or reel to avoid induction effect.I did not understand this.

Thank You.

PS:I am connecting my sample resistance wire(with its length constant) and taking different values of V and I by altering the rheostat resistance.

Source Link
Karan Singh
Karan Singh
  • 733
  • 4
  • 13
  • 26

Ohm's law experiment

I was going through my physics laboratory manual. In the Ohm's Law Experiment, the book states a few precautions without any reasoning.

1.The wire whose resistance has to be determined should ideally be made up of alloys such as Manganin and not a metal. 2. A low resistance rheostat should be used.

Any reason why this is so?

Also the book says that the resistance wire must be wound on its self before it is wound on bobbin or reel to avoid induction effect.I did not understand this.

Thank You.