Should Car Jumper Cables Be 3 Meters or 4 Meters?

[DiLucas]

Car jumper cables are generally about 3 meters long. They should not be too long, as excessive length increases resistance and consumes power; nor should they be too short, as insufficient length makes connection difficult. The specific method for using car jumper cables is as follows: Connect positive to positive: Clamp the red cable of the jumper wire onto the red positive terminal of the "rescued vehicle," then clamp the other end of the red cable onto the red positive terminal of the "rescuer vehicle." Connect negative to negative: Clamp the black cable onto the black negative terminal of the "rescued vehicle," then clamp the black cable onto the black negative terminal of the "rescuer vehicle." Remove in order: First start the engine of the "rescuer vehicle," then start the engine of the "rescued vehicle." If the rescued vehicle still fails to start, check for poor metal contact. After successfully starting the engine, the jumper cables must be removed in order; otherwise, a short circuit may occur.