Question

a) In a switching device, there is a task of designing the Contacts (electrical contacts). For that, you have been asked to choose a material. What properties should you consider in design? What type of material is preferable for such application?

b) What is the difference between the microstructure and the macrostructure of a material?

Answer 1

a)

The properties required for electric contact are

• good conductivity
• resistance against corrosion
• cost friendly

Highly conductive material like silver is the most prefered material as electric contacts as it is also has high resistance against corrosion (inert material) and also cost friendly when compared to other materials which can be used such as gold, platinum etc.

b)

The difference between microstructure and macrostructure of a particle is that, microstructure is the structure of the most minute particle of a material which can be seen by magnification of the material which can include the atoms, nucleus, electrons etc. While microstructure is the structure of material which is visible to us with our naked eyes.

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