Question

Two wires of equal length, one of copper and the other of manganin (an alloy) have the same thickness. Which one can be used for (i) electrical transmission lines (ii) electrical heating devices? Why?

Answer 1

Hint: Let us get some idea about the manganin. Manganin is a trademarked term for a copper-manganese-nickel alloy with an average composition of \[84.2\% \]percent copper, \[12.1\% \]percent manganese, and \[3.7\% \]percent nickel. Manganin foil and wire are used in the production of resistors, especially ammeter shunts, due to its low temperature coefficient of resistance and long-term stability.

Complete step-by-step solution:Solution:
Firstly get some idea about the transmission lines. The transmission line is the means by which power is transferred from the generator to the load centre. It is primarily divided into two categories. They're the ones. Transmission Line for AC Power.
Let us talk about first bit (i) electrical transmission lines:
The transmission line is the means by which power is transferred from the generator to the load centre. It is primarily divided into two categories. They're the ones. Transmission Line for AC Power.
(ii) Electrical heating devices: Manganin can be used in electrical heating devices because its resistivity is around 25 times that of copper, which means it generates a lot of heat as current passes through it.

Note: Normal resistance coils are made from alloys like manganin and constantan, which have a high resistivity and a low temperature coefficient of resistance. As a result, wire-bound standard resistors are made with these alloys. Temperature would have no impact on their resistance value.