Correct Answer - Option 1 : standard resistance
CONCEPT:
Electrical Resistance:
- The measurement of the opposition of the flow of electric current through a cross-section of the material is called the electrical resistance of that material.
- It is denoted by R.
- The relationship between resistance and temperature is given by,
⇒ R = Ro(1 + αΔt)
Where R = resistance at a reference temperature, α = temperature-coefficient of a conductor, and Δ T = changes in temperature
- For metals, α is positive and for semiconductors, α is negative.
- Some materials like Nichrome (which is an alloy of nickel, iron, and chromium) exhibit a very weak dependence of resistivity with temperature.
- Manganin and constantan have similar properties. These materials are thus widely used in wire-bound standard resistors since their resistance values would change very little with temperatures.
EXPLANATION:
- Some materials like Nichrome (which is an alloy of nickel, iron, and chromium) exhibit a very weak dependence of resistivity with temperature.
- Manganin and constantan have similar properties. These materials are thus widely used in wire-bound standard resistors since their resistance values would change very little with temperatures.
