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TobyBartels comments on Procedural Knowledge Gaps - Less Wrong
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Like SRStarin said, you can actually just hook negative to any old metal around the opening, because THE WHOLE CAR EXERIOR is negatively charged. How cool is that?? Many cars have a point in the hood opening near the battery mount that is shaped to be easily clipped-to.
It's a matter of voltage, not charge. The negative terminal of the battery has lower voltage than the positive terminal. The car's metal frame is in contact with the negative terminal, so it's at that same voltage, even though it's still neutrally charged.
I am enlightened.