Question

4. The conductivity of the several material are given in the table below. a) Choose two materials and create a resistor with 10. You are free to choose the resistor geometry as planar, cylindrical or spherical form and also you could use resistors in a series or parallel connection b) Which geometry and material should be used to create the smallest (physically) resistor? Explain. c) What would be the maximum electric field when it is connected to 1 Volt source? Material Silver Copper Gold Aluminum Iron Tin Stainless steel GaAs (semiconductor) Carbon (amorphous) Germanium Conductivity [S/m] 6.3x10 5.7x10 4.1x10 3.5x10 1x10 9x106 1.5x100 100 500 2

Answer 1

(b) For the smallest physical resistor, the conductivity should be as low as possible. In our case, we can use Germanium.

Geometry should be planar as for the fixed length, area should be minimum for maximizing the resistance.