Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
You started with a topic slightly more complex than it first appears. I've never seen a variable resistor properly modeled in LTspice. You can STEP a resistor value through a single simulation over a set of values but constant variability is not so easy.
You don't need LTSpice to determine power over a resistor though, all you need to know is the voltage and use a calculator.
First, this topic should be in This forum.
Second, does this do what you want?
Third, here is an alternate way to do it, where the resistor is a function of time.
sorry for posting here