The longer the companion heat band, the higher its resistance, not lower. This conclusion is derived from the calculation formula for resistance and the qualified standards for companion heat band resistance.

Thermal resistance and impedance relationship:

The resistance calculation formula is R = ρL/S, where R is resistance, ρ is resistivity (an inherent property of the material), L is length, and S is cross-sectional area. From this formula, it can be seen that resistance R is directly proportional to length L and inversely proportional to cross-sectional area S. Therefore, when the resistivity and cross-sectional area remain constant, the longer the heating tape, the greater the resistance.

Specifically, the qualified standard for the resistance of the two heating cables is no more than 30 ohms per meter, which is set according to international standards. The calculation, measurement, and control of resistance have a significant impact on the quality and performance of the heating cables. During the production and use of heating cables, strict monitoring and control in accordance with international standards are required to ensure their low power consumption, high efficiency, and safe and reliable characteristics.

Additionally, the thermal resistance of the heating tape is affected by various factors, including material, diameter, number of strips, and hardness, among others. Therefore, when selecting and using heating tape, it's necessary to consider these factors comprehensively based on actual needs and environmental conditions to ensure its proper operation and long-term performance.