For the last example, simulate the circuit in Fig. $5$ and verify that Vout $=5$ V$.$ You will not find the potentiometer in the LTspice component menu. See the class website for the files. To add a component like this one you will need to add two files to the library folder, the path of which is displayed at the top of the screen when drafting a new component. Add the symbol file $(.$asy$)$ and the model file $($this can have any extension; in this example it$$s simply $.$txt$)$ to your LTspice model library.

When you use the symbol, you can direct the program to the correct model with either a $.$lib or $.$include statement. The help section on Third$-$party Models may prove useful. If you prefer to create your own potentiometer model, see Creating New Symbols in the help menu.