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
- electrical transmission lines
- electrical heating devices? Why?
Answer:
- Copper wire can be used for electrical transmission lines because copper has very low resistivity and hence it is very good conductor of electricity.
- Manganin can be used for electrical heating devices because the resistivity of manganin is about 25 times more than that of copper and hence it produces a lot of heat on passage of current through it.