Question

Explain the following:
(i) Copper and Aluminum wires are employed for electricity
transmission.
(ii) Heating devices are made of an alloy rather than a pure metal.
(iii) Tungsten is used for filament of electric lamp.

Answer 1

Answer:

(i). Cu and Al are used for electrical wires as they are good conductor of electricity and are cheaply available, other than Ag.

(ii).alloy increase the capability of material,as they can hold longer than a single element/metal. like steel

(iii). W is a element with a very high melting point,(3560°C)

thus it is used for filament.

Answer 2

Answer:weight

Explanation: 1.copper wire are used for electrical transmission because of there least resistance to electric current

even they are good conductor of electricity after silver  

2. the reason is

alloy are mixture of two or more elements

they also have high melting point and resistivity

3.this is because

tungsten has high melting point and high resistivity