a copper bar carrying 1200 a has a potential drop of 1.2 mV along 24 cm length. what is the resistance per minute of the bar?
The manual is correct. As with all these engine warning light is on type questions, all you can do is take it to a garage with the proper diagnostic gear and get the fault codes scanned. That'll tell them what the problem is. And just because it seems to be OK doesn't mean you should ignore it, what can start as a small ?100 fix could end up costing a fortune to fix if it's not done soon.
From V IR R V / I 0.0012 / 1200 1 x 10^ -6 ohms 24 cm 1 x 10^ -6 ohms 1 metre ? (you have typed 1 minute--- I think it should be 1 metre!) Resistance is proportional to length. So: Res 1 x 10^-6 / 0.24 4.16 x 10^ -6 ohms
yes you can bring it to anywhere outside the dealership network but the other garages may not have the same experience or computers that an audi dealer would.as for your engine light it is hard to say what it could be without doing a scan with a computer, your ecu has an event memory and that fault could be stored in there.
