What is an alloy? Name the alloys and their constituents used for

cables, respectively.

Alloys are:

• Alloys are substances that are prepared by mixing $2$or more metals in molten state, or a metal or non-metal.
• They have low melting point $(M.P)$, and are highly electricity resistant.
• They are resistant to corrosion, and they are hard and have high tensile strength.

(b) Alloys used in making cables:

1. Nickel steel: It is made up of $97\%$ iron, $1\%$ carbon, and $2\%$ nickel. It is used as it is hard, and corrosion resistant.
2. Invar: It is made up of $64\%$ iron, $36\%$ nickel. It is used as it has low coefficient of expansion.