(a) List the factors on which the resistance of a conductor in the sha

1.	(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 clectricityGive reason.(c) Why are alloys commonly used in electrical heating devices? Give reasons.
Answer» There are four factors that influence the resistance in a conductor.Thickness(cross sectional area of the wire),length, andtemperature. The fourth factor is theconductivityof thematerialthat is used. Metalparticles are held by strong metallic bounds that is they have high melting and boiling points. Thus free electrons inmetalscan move through themetalsallowingelectricityto pass through themetals. Alloysareused in electricalheating devices rather than pure metals because the resistivity of analloy ismore than the resistivity of a pure metal.

(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 clectricityGive reason.(c) Why are alloys commonly used in electrical heating devices? Give reasons.

Answer»

There are four factors that influence the resistance in a conductor.Thickness(cross sectional area of the wire),length, andtemperature. The fourth factor is theconductivityof thematerialthat is used.

Metalparticles are held by strong metallic bounds that is they have high melting and boiling points. Thus free electrons inmetalscan move through themetalsallowingelectricityto pass through themetals.

Alloysareused in electricalheating devices rather than pure metals because the resistivity of analloy ismore than the resistivity of a pure metal.

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