For wiring in the home, one uses Cu wires or Al wires. What considerations are involved in this?

When a wire is twisted the strain produced in it is _____.

A copper wire is stretched by one percent of its length. What is the energy stored per unit volume of the wire if Y for its material is 11 xx 10^10 N/m^2 .

2 amp current flowing through a wire produces 10 calories ofheat in 20 seconds.What is the resistance of the wire ?

An aluminium wire and a steel wire both of the same length and cross-section are joined end to end . The composite wire is hung from a rigid support and a load is suspended from the free end . If the increase in length of the composite wire is 2.7 mm, find the increase in length of each wire. Y_al = 7 xx 10^10 N/m^2 and Y_steel = 2 xx 10^11 N/m^2 .