Question

(a) List the factors on which the resistance of a conductor in the shape of the wire depend.
(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 eletrical heating devices ? Give reason.

Answer 1

Explanation:

a) the resistance of a conductor in the shape of the wire depend on resistivity,length,area of cross section

b)metals good conductors of electricity because which allows the flow of electric current.but glass acts as a insulators it doesn't carry electric currents

c)reasons alloys are the combination or mixture of two or more metals ex.bronze is combination of copper and tin.it conducts electricity

Answer 2

Answer:

a. Depends on Resistivity,length and area of cross section .

b. Metal allow flow of electric current and glass doesn't allow as it is a insulator.

c. Alloy have high Resistivity and high melting point than pure metal