oki, here's the deal, i have a 540W heating coil 110V nichrome wre 0.600mm in diameter. considering the variaion of resistivity with temperature, waht will the coil 4.2236 m actually deliver when it is heated to from 1200 C from 20 C. i have tried using R=R[o]*(1+alpha8(T-T[o]) and using alpha as .0004 and R as the ohms found from wattage and volts. where am i going wrong?Resistivity with temperature refers to the measure of a material's resistance to electric current flow as its temperature changes. It is represented by the Greek letter rho (ρ) and is measured in units of ohm-meters (Ω*m).
Resistivity generally increases with an increase in temperature for most materials. This is because as temperature increases, the atoms within the material vibrate more, causing more collisions and hindering the flow of electrons, leading to an increase in resistance.
Resistivity with temperature is an important factor to consider when designing electrical systems. It can be used to predict the behavior of materials at different temperatures and ensure that the system can handle the changes in resistance that may occur.
Different materials have different resistivity-temperature relationships. Some materials, such as metals, have a positive temperature coefficient, meaning their resistivity increases with temperature. Others, like semiconductors, have a negative temperature coefficient, meaning their resistivity decreases with temperature.
The equation for calculating resistivity with temperature is ρt = ρ0 [1 + α(Tt - T0)], where ρt is the resistivity at a given temperature (Tt), ρ0 is the resistivity at a reference temperature (T0), and α is the temperature coefficient of resistivity. This equation is known as the temperature coefficient formula.