Wednesday, February 24, 2010

The resistance of a conductor is a measure of the ability of the conductor to resist the flow of an electric current through it.
An important effect of a resistor is that it converts electrical energy into other forms of energy,
such as heat and light.

Factors that affect resistance of a conductor:
1. the length of the conductor
~The longer the conductor , the higher its resistance

2. the cross-sectional area of the conductor
~The bigger the cross-sectional area, the lower the its resistance

3. type of material of the conductor
~ Different conductors with the same physical conditions have different resistance

4. the temperature of the conductor

~ The higher temperature of conductor , the higher the resistance.

simulation :
R= resistance [Ω]
ρ = resistivity of the substance[Ωm]
L = length [m]
A = cross-sectional area of conductor [m 2]

Worked example :


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