Two wires of equal lengths, one of copper and the other of manganin (a

1.	Two wires of equal lengths, one of copper and the other of manganin (an alloy) have the same thickness. Which dne can be used for: (i) electrical transmission lines, (ii) electrical heating devices? Why?
Answer» (i) Copper is used as electrical transmission lines as it has lesser resistivity. (ii) Manganin is used for electrical heating device as it has the comparatively higher resistivity, less oxidation and variation with temperature.

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

Answer»

(i) Copper is used as electrical transmission lines as it has lesser resistivity.

(ii) Manganin is used for electrical heating device as it has the comparatively higher resistivity, less oxidation and variation with temperature.