Question

b. Write three factors on which resistance of a conductor depends.​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Factors that Effect Resistance

The resistance of a conductor is determined by the following:

The material that makes up the conductor

The cross sectional area of the conductor

The length of the conductor

The temperature of the conductor

Area

Just as a thick water pipe can carry a large flow of water than a thin pipe, so a thick conductor is able to carry more current than a thin one made of the same material.

Length

The resistance of a conductor is due to the atoms on the conductor with which the electrons are continually colliding. An electron moving through 2 metres of conductor has to get past twice as many atoms as it would if it was only moving through 1 metre of conductor. Thus it stands to reason that the 2-metre conductor has twice the resistance.

Temperature

The resistance of most conducting materials are affected by the temperature of the conductor. Usually, the higher the temperature of the conductor, the higher the resistance.

1.2 Resistivity of Material

Different materials offer different resistances to current. To allow direct comparisons between materials we use the parameter of resistivity or specific resistance.

The specific resistance (or resistivity) of a material is the resistance of one metre cube of the material. Unit: ohm.metre.

The resistivity of a conductor material is usually quoted at a specified temperature (20 deg C). A correction factor, referred to as the temperature coefficient of resistivity, may need to be applied if the operating temperature is significantly different.

1.3 Equation for Resistance

As discussed above, the resistance of a conductor of a specific shape is proportional to its length, and inversely proportional to its cross-sectional area:

Where R = resistance; rho = resistivity of material; l = length of conductor; A = cross sectional area of the conductor

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