Nichrome wire is a type of resistive wire that is commonly used in heating elements due to its high resistance and ability to generate heat when an electric current passes through it. Typically, nichrome wire follows Ohm's law, which states that the current passing through a conductor is directly proportional to the voltage applied across it, as long as the temperature and material properties remain constant.
However, nichrome wire's resistance can change with temperature, and it is known to exhibit a positive temperature coefficient of resistance (PTCR), which means that its resistance increases as its temperature increases. As a result, nichrome wire may deviate from Ohm's law at higher temperatures or when subjected to high voltages, as the change in resistance with temperature can impact its electrical behavior.
In general, nichrome wire can be expected to follow Ohm's law over a range of voltages and currents that do not cause significant temperature changes in the wire. The specific range of voltages over which nichrome wire follows Ohm's law would depend on factors such as the wire's diameter, length, and temperature coefficient of resistance, as well as the desired level of accuracy in the application. It is important to consider the specific characteristics of the nichrome wire being used and monitor its resistance during operation to ensure that it is operating within the desired range and following Ohm's law accurately