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## Re: [Help-gnucap] pure inductance simulation

**From**: |
Josef Vukovic |

**Subject**: |
Re: [Help-gnucap] pure inductance simulation |

**Date**: |
Thu, 1 Jul 2010 20:34:33 +0200 |

010/7/1 al davis <address@hidden>:
>* On Wednesday 30 June 2010, Josef Vukovic wrote:*
>*> I have a question reagrdig my gnucap simulation of a pure*
>*> inductance.*
>*>*
>*> Here is my gnucap code:*
>*>*
>*> Pure Inductance:*
>*>*
>*> V 1 0 sin(0 220 50)*
>*> L 1 0 100m ic=0V*
>*>*
>*> .print tran v(1) i(L)*
>*>*
>*> .tran .001 .02 >AcXl.dat uic*
>*> .end*
>*>*
>*>*
>*> When I plot the simulated data with gnuplot I get*
>*> a Voltage leading current by 90 degrees, but the*
>*> current is only positive and don't change to negative*
>*> values. How can I simulate a pure inductance with gnucap?*
>
>* The results are correct.*
>
>* The input starts at zero. For as long as it is positive,*
>* current will rise. When the input goes negative, current will*
>* drop, and continue to drop as long as it is negative. Since the*
>* wave is symmetric, this returns it to zero, so in this case the*
>* current will always be positive.*
>
>* You can get negative current with a different starting point.*
>* Try setting ic=-10. Note that for inductors, ic (initial*
>* condition) is current, even if you say "ic=0V". The "V" is*
>* ignored.*
>
>* _______________________________________________*
>* Help-gnucap mailing list*
>* address@hidden*
>* http://lists.gnu.org/mailman/listinfo/help-gnucap*
>
Hm, that's somewhat quiet confusing! Where is the alternating current
he sould change his direction :-( but anyway thank you for the explanation.
regards