Why do we need to attach one negative cable to bare metal when jumping a car?
In: Engineering
Your starter is shorted to the car frame for the safety reasons given by other users, and to prevent electric shock. However, if you’re trying to start your car, if the leads are connected to the battery the electricity must first flow through your battery and then to your starter. If you connect the ~~positive~~ negative to the car frame, the current can flow directly through the starter, which is faster and more efficient.
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