Nollalämpötilakertoimen

Nollalämpötilakertoimen, or the temperature coefficient of resistance at zero, is a value that describes how the electrical resistance of a material changes with temperature, specifically at a reference temperature of 0 degrees Celsius. It is a key parameter for understanding and predicting the behavior of resistors and other resistive components.

The value is typically expressed in units of per degree Celsius (1/°C) or parts per million per degree Celsius (ppm/°C). A positive nollalämpötilakerroin indicates that the resistance increases as the temperature rises above 0°C, which is characteristic of most metals like copper and aluminum. A negative nollalämpötilakerroin means the resistance decreases with increasing temperature, a property found in semiconductors and some other materials.

Materials with a very low nollalämpötilakerroin are desirable for applications where stable resistance is crucial, such as in precision measuring instruments and high-accuracy electronic circuits. This coefficient is essential for engineers designing circuits that need to operate reliably across a range of environmental temperatures. It allows for compensation techniques to be employed, ensuring consistent performance.