(a) List the factors on which the resistance of a conductor in the shape of a wire depends.(b) Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason?(c) Why are alloys commonly used in electrical heating devices? Give reason.
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A .The resistance of conductor depends upon the cross sectional area and lenth of wire
B.metals are good conductors than glass because the space bw metal atoms is negligible and easy way gor conduction while in glass there is a larger space bw the SiO3 atoms
C..Alloys are the mixture of metals and non metals which is easily conductable for heat and electricity .. It is also of less cost
B.metals are good conductors than glass because the space bw metal atoms is negligible and easy way gor conduction while in glass there is a larger space bw the SiO3 atoms
C..Alloys are the mixture of metals and non metals which is easily conductable for heat and electricity .. It is also of less cost
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Explanation:
Resistance of conductor is directly proportional to length (1) of the conductor.
R ∝ l
Resistance of conductor is inversely proportional to area of cross section of conductor.
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Resistance also depends on a material of conductor §.
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Resistance and resistivity also depends on temperature.
2.Metals have more free electrons than glass to carry currents. That’s why glass is bad conductor and metals are good conductors.
3.Alloys are used rather than pure metals in electrical heating devices, since they have low electrical conductivity and also low melting point
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