Manganin is made up of metals that include copper, manganese and nickel - what do you generally call a metal of this type?

• Correct Answer: alloy
• mixed metal
• complex metal
• silicon

Explanation: for metals, meaning their resistivity increases with temperature. Some alloys have been developed specifically to have a small temperature dependence. Manganin (which is made of copper, manganese and nickel), for example, has α close to zero (to three digits on the scale in Table 20.2), and so its resistivity varies only slightly with temperature. This is useful for making a temperature-independent resistance standard, for example.

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