Electrical resistivity of an alloy of copper and nickel is ________ when compared with the electrical resistivity of an alloy of copper, manganese and nickel.
Answers
Explanation:
resistivity of alloys is much higher than those of the pure metals (from which they are made). For example, the resistivity of manganin (which is an alloy of copper, manganese, and nickel) is about times more than that of copper; and the resistivity of constantan (which is an alloy of copper and nickel)is about times more than that of copper metal. It is due to their high resistivities that manganin and constantan alloys are used to make resistance wires (or resistors) used in electronic appliances to reduce the current in an electrical circuit. Another alloy having a high resistivity is nichrome. This is an alloy of nickel, chromium, manganese, and iron having a resistivity of about times more than that of copper.
Name the alloys which have very high resistivity as compared to copper.