The noise electromotive force of resistor is composed of thermal noise and current noise. The noise of wire wound resistor is only limited to thermal noise, while the thin film resistor has current noise in addition to thermal noise, because irregular vibration occurs between conductor particles under the action of applied voltage

The noise electromotive force of resistor is composed of thermal noise and current noise. The noise of wire wound resistor is limited to thermal noise, while the thin-film resistor has current noise in addition to thermal noise. This is because under the action of applied voltage, irregular vibration is generated between conductor particles, which makes the resistance value fluctuate, thus modulating the current flowing through the resistor.

Generally, the noise and noise electromotive force of metal film resistor, carbon film resistor and wire wound resistor are small, while the noise and noise electromotive force of synthetic film resistor and solid core resistor are much higher. For the high amplification stage and high gain preamplifier stage of the receiving circuit, it is better to select metal film resistor and carbon film resistor.