What are the factors that affect wire resistance in automotive wiring harnesses?

Automotive wire harness wire resistance is very important for the transmission of current, the factors affecting wire resistance are as follows: 1. Temperature Temperature has different effects on various materials. For example, the resistance of copper and steel increases with increasing temperature, and for some materials, the resistance of the material decreases with increasing temperature, and when making wire resistance measurements, we have to disconnect the wire under test from the circuit.2. Cross-sectional areaThe larger the cross-sectional area of the wire, the more electrons it means that pass through the wire in the same amount of time. The thinner the wire, the more difficult it is for current to pass through and the higher the resistance of the wire. The resistance decreases as the wire diameter increases. When replacing a wire harness, use one with the same wire diameter. If a thinner wire harness is used, the resistance of the wires increases. As the resistance increases, the power consumed by the wires increases, and the harness overheats or melts.3. Length As the length of the wire increases, the resistance increases because electrons have to pass through more atoms. Electrons traveling through a shorter wire encounter fewer atoms and thus have less resistance.4. Rust in the circuit also has an effect on resistance, which increases when rust occurs. Automotive wiring harness wire inspection for the wire inspection need to use the multimeter resistance block to measure the resistance of the wire. Specific methods of operation are as follows: first of all, the measured wire is disconnected from the circuit; then the multimeter to select the appropriate range, the needle of the multimeter and the wire contact, if the resistance exceeds the standard value, you need to check the grounding of the wire and the plug has not appeared in the state of false connection.

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