You might want to jump further and go to "Fundamentals of Alternating Current. A fluctuating DC is AC just with it's baseline moved up. You can assume the coil to be a resistor but the #'s you come up with are not going to be exact. When you test the coil on a battery it will be with a steady DC so you can use the more simple DC calculations. They will not work once you try to measure when the ECU is running the idle motor. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, mike.griese@xxxx wrote: > Read page 4. A coil is not a resistor, it's an inductor. > Different math applies. > > -- > Mike > > > -------------- Original message from "Elvis Nocita" <elvisnocita@xxxx>: -------------- > > > > What ? > > I was as realistic as possible - I used the car's battery !!!! > > > > 12V not 12 amps ! > > > > amps is the current that will flow when a resistor is connected > > between the two poles of a voltage source. > > Ohm's law: R = U / I -> I = U / R > > > > U is fix (12.5V only battery and about 13.8V with engine running) > > Resistor of the motor is also fix = 14 Ohm. > > > > So the max current can be only 1A. > > > > Sorry but this is basic knowledge that is described in any > > basic electronics book on the first 2 or 3 pages. > > > > Elvis > > > > [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/