# Vechicle circuit grounding

In vechicles ac current is generated and they are used for lightining and other purposes. From the dynamo one wire is taken and given to the
bulbsand the other end of the other end is connected to the body of the vechicle. My doubt is that won't the resistance of the body of the vechicle include in the circiut. The body of the vechicle is made up of steel or some metal other than copper. Hence their resistance is more.
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No, DC. (In the case of an alternator, is contains integral rectifier.)

Yes.
There's so much more effective cross-sectional area, the resistance is actually a lot less than the copper wires.
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Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
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rtk wrote:

Resistance isn't just dependent on the resistivity of the material - it also depends on how much of it is in the circuit.
A conventional steel car body has *lots* of steel. So, unless it is a rusted-out wreck, there isn't any significant resistance between two points on the body. There are lots of parallel paths in the body for electricity to flow through - far less resistance than a wire, even a copper wire, would provide.
Places that could provide a high resistance, such as engine mounts, are bridged with short lengths of wire.
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Sue

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rtk wrote:

AC is 'generated' by the alternator
Rectified & regulated internally to ~13.8V DC
This DC is used for vehicle power
Resistance of the body is negligable because there is so much of it
Poor negative connections to the body cause electrical problems - mostly in older vehicles
If you are running high currents to stereos or lights, the negative cable must be the same size as the positive cable
A sheet metal screw into a panel is not suitable for a high current negative - run a cable to the battery or use a good size bolt and clean off the paint
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In article <386218ba-0242-4f62-9486-
alt.engineering.electrical, snipped-for-privacy@gmail.com says...

Interesting! Got an AC battery to go with that dynamo too?
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Keith