I am using LTSPICE to couple toghter two RLC circuits for frequency analysis. I need to measure the power flowing through the primary side and induced powered in the secondary. I am able to measure the voltage and current at different frequencies and need a formula to find out the power. This is my first dive into AC circuits and am a bit confused regarding RMS power.

Thank you for reading!.

 

hi 18,
Welcome to AAC.
Please post your LTS asc file, we can check it.
E

 

Here is My Schematic. Thank you for responding. Quick Question How do I get rid of the dotted graph curve that seems to follow the main curve?.

 

hi,
For the plotted dotted phase line , right click on the rightside degrees scale, pop up menu , 'dont show phase'' button.
E

 

The power can be calculated when doing a transient analysis.
For example, the V2 supply average Power (RMS) is the average of the instantaneous voltage across a device times its current at the same point in time.

In LTspice plot the voltage across the component.
Right click on the plot name to open up the plot expression editor and change to V(part) * I(part) (first attachment below).
Then Ctrl-Left Click that plot to get the power average value (second attachment below).

The power dissipated in a resistance can also be calculated by measuring the RMS voltage across it, squaring that voltage, and then dividing that by the resistance.

 

The advantage of using LTSpice, is that it is ubiquitous and there will always be someone who knows a trick or shortcut.