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CBSE Class 10 Answered

difference between resistance and resistivity.
Asked by Mrinal Ghezta | 18 Jun, 2014, 06:25: AM
answered-by-expert 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.
Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '.
The resistance of a wire depends on the following factors:
Directly proportional to the length (l) of the wire. Inversely proportional to the area of cross-section of the wire. Nature of the material of wire.

combining all we can write that.

Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '..

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 | 19 Jun, 2014, 10:33: AM

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