Discussion and questions related to the course Motorsport Wiring Fundamentals
I have heard elsewhere that a longer wire increases the resistance. Just wondering how true this is and is it significant enough to play a part in sizing qires?
It's true. But unless you're wiring a bus, you don't need to worry about it for car-sized vehicles. Exception is high-current (like battery cable) going to a starter, often the wires are up-sized to improve starter performance.