In general, resistivity of an alloy ______ its constituent metals.
is higher than
Resistivity of Alloys vs Constituent Metals
In general, the electrical resistivity of an alloy is higher than that of its individual constituent metals.
Reasoning for Higher Resistivity
Alloys are mixtures of metals or a metal and one or more non-metals. Their atomic structure is less ordered compared to pure metals. This increased atomic disorder leads to:
- Increased Electron Scattering: The presence of different types of atoms and the lack of a perfect lattice structure significantly disrupt the flow of electrons. Electrons collide more frequently with these imperfections.
- Impeded Conductivity: More scattering means more resistance to the flow of electric current, resulting in higher resistivity.
For example, materials like Nichrome (an alloy of Nickel and Chromium) are used in heating elements because their resistivity is much higher than that of pure Nickel or Chromium, allowing them to generate more heat for a given current.
Important Questions from Metals and Properties
In Stress & Strain diagram, stress is always represented on the ______.
What is the primary material used in the resistance wire of wire-wound resistors?
Which of the following statements about the resistivity of metals is INCORRECT?
Aluminium in its pure form is not used for engineering work because
The ability of a metal to withstand shock and impact
