difference between resistance and resistivity.

Asked by Mrinal Ghezta | 18th Jun, 2014, 06:25: AM

Expert Answer:

Resistance of a conductor is the property of a conductor due to which it opposes the flow of current through it .Resistance of a conductor is numerically equal to the ratio of potential difference across its ends to the current flowing through it.
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The resistance of a wire depends on the following factors:
  1. Directly proportional to the length (l) of the wire.
  2. Inversely proportional to the area of cross-section of the wire.
  3. Nature of the material of wire.

combining all we can write that.

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Here, ρ is the constant of proportionality and is called the electrical resistivity or specific resistance of the material of the wire.
The resistivity will be given as Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '.

If l= 1, A = 1, then r = R.

Thus, we define resistivity as the resistance of a wire of that material of unit length and unit area of cross section.

Answered by Jyothi Nair | 19th Jun, 2014, 10:33: AM