Sep 1, 2014

Factors affecting the resistance



factors affecting resistance

Length of the material

The resistance of a substantial is directly proportional to the length. The resistance of lengthier wire is a lot of. It is denoted by “l”.

Cross sectional area

The resistance of a substantial is reciprocally proportional to the cross-sectional space of the fabric a lot of cross-sectional area permitted the path of additional number of free electrons, giving less resistance. It is denoted by 'a'.

The nature of the material and its type

It contains a more number of free electrons or not, distresses the value of the resistance.Therefore material that is conductor has less resistance whereas associate nonconductor has terribly high resistance.

Temperature

The temperature of the material affects the value of the resistance. Typically the resistance of the material will increase as its temperature will increase. Typically impact of tiny changes in temperature on the resistance is not thought of as it's negligibly tiny.

So for a bound material at a bound temperature we have a tendency to will write a mathematical expression as,
R ∝ (l/a)
and impact of nature of material is thought of through the constant of proportion denoted by p (rho) known as resistance or specific resistance of the material. So finally,
R=(ρl)/a
Where,
L = length in meters
A = cross sectional area in sq.meter
ρ = resistivity in ohm–meters
R = Resistance in ohms


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