RE: [Cal_Boats] Re: gas engine question

Whoever gave this response, thank you very much. The back EMF causes the current flow to drop. The DC resistance of the coil wire is not the driving factor. Kind of like a capacitor starts high current, then it drops off a the capacitor charges. The inductor is similar to the capacitor except that the energy is stored in the magnetic field instead of in the electron charge (as in the capacitor). Take Care Charlie From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] Sent: Saturday, July 05, 2014 9:47 AM To: Ca… [at] yahoogroups.com Subject: [External] [Cal_Boats] Re: gas engine question A coil is an inductive electrical circuit which opposes the flow of current through it. The current limiting factor is due to the presence of the self induced emf within the inductor as a result of the growth of magnetic flux, (Lenz’s Law). After a time the voltage source neutralizes the effect of the self induced emf, the current flow, quickly reduced from a theoretical initial short circuit, becomes constant and the induced current and field are reduced to zero.

Kind of like a capacitor except totally the opposite. When a voltage is applied, a capacitor starts off at high current and drops to zero. An inductor starts at zero current and increases. Inductor v = L*di/dt Capacitor i = C * dv/dt See, very similar but opposite. Said another way, with a capacitor, the voltage is proportional to the integral of the current. The longer you supply a current to a capacitor, the higher the voltage. Similarly, with an inductor the current is the integral of the voltage. The longer you apply a voltage, the higher the current. If there is no resistance, the current will grow until it is infinitely large at which point the thing blows up. It has been a long time since I studied this stuff but I do have a masters in electrical engineering from a local college here in Palo Alto. Allen On Sat, Jul 5, 2014 at 8:21 PM, 'Husar, Charlie [USA] (ASE)' hu… [at] bah.com [Cal_Boats] <Ca… [at] yahoogroups.com> wrote: > > > Whoever gave this response, thank you very much. The back EMF causes > the current flow to drop. The DC resistance of the coil wire is not the > driving factor. > > > > Kind of like a capacitor starts high current, then it drops off a the > capacitor charges. The inductor is similar to the capacitor except that > the energy is stored in the magnetic field instead of in the electron > charge (as in the capacitor). > > > > Take Care > > Charlie > > > > *From:* Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] > *Sent:* Saturday, July 05, 2014 9:47 AM > *To:* Ca… [at] yahoogroups.com > *Subject:* [External] [Cal_Boats] Re: gas engine question > > > > > > A coil is an inductive electrical circuit which opposes the flow of > current through it. The current limiting factor is due to the presence of > the self induced emf within the inductor as a result of the growth of > magnetic flux, (Lenz’s Law). After a time the voltage source neutralizes > the effect of the self induced emf, the current flow, quickly reduced from > a theoretical initial short circuit, becomes constant and the induced > current and field are reduced to zero. > > > >