LTSpice AC simulation Fault ?

Thread Starter

BastiaanMark

Joined Dec 9, 2008
2
In LTSpice I simulate with AC generator a capacitor 100µF in series with 100 Ohm resistor.
The simulation Graph Plots Current Through C and Voltage After C in the SAME Phase ?
In Theory the current should Lead the Voltage over a capacitor.
Other Simulation programs eg Simetrix and Multisim Do have a 90 Degree Phase difference between Current and Voltage.
Not in LTSpice !? Why !
 

kubeek

Joined Sep 20, 2005
5,794
Wow, congrats to your first post after 10 years of being here :)
Note that when you measure current in a component, you will see an arrow that shows which way is positive. You could have your resistor "backwards" from the way the simulator shows it, and it will show the current 180° out of phase in AC simulation, or negative in DC and transient.
 

Thread Starter

BastiaanMark

Joined Dec 9, 2008
2
Thanks for Reply !
Doïng something wrong + I have Read a lot of LTSpice Threads on this Forum did thogether light the Bulb !
You have to pre-Set the Simulator Options in the First place.
Which in the Other Simulators its Factory pre-set, more user Friendly, can be Altered by Experts if needed in the Second place.
LTSpice is in my Opinion more something for Experts.
Conclusion made out of WHO did Reply !
I almost forgot, Yes ! Current & Voltage are out of Phase NOW ! It Works !
In the 10 Years past I had a lot of Reference, until this Question.
 

kubeek

Joined Sep 20, 2005
5,794
I think you can play with LTspice right away, no need to be expert. The interface is a bit quirky and outdated, but for most circuits you should not need help or googling.
 
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