Determine the electrical conductance of a 2m length of nichrome (a high temperature Ni Cr alloy) wire at 20°C with cross-sectional area 1mm^ Nichrome has a conductivity of 0.9×106 Sm^-1 at this temperature. The answer is 0.45S

What are the crystal structures of single crystal Si and single crystal GaAs? How are they similar/different?

An 18-gauge copper wire with a diameter of 1-mm carries a constant current of 1-A. The charge concentration in the wire is 8.5 x 1028 per cubic meter. Determine the resistance, in ohms, of a 77-m wire in milli-ohm. Use resistivity equal to 1.72x10-8 ohm-m.

A platinum resistance temperature detector (RTD) is used to measured temperature of the hot gas. The resistance of sensing element is 250.3 ohm when it contact with hot gas, calculate the temperature of the gas. The RTD has a resistance of 120 ohm and 80 ohm at 100°C respectively. The temperature coefficient of platinum is 0.0039 C^-1.

question 7

Calculate the equivalent resistances Rin of the following circuits. (The resistance value of the diodes in the conduction will be 0, the resistance value of the diodes in the insulation will be taken as infinity. R1=10ohm