How to precisely define the placement of the labels in circuitikz?

Question

I want to have complete control on where to put the labels R1 and L1, the annotation 100 Ohms and the Voltage VL.

1. For example, how to move L1 label a little more to the right, and a little more to the up?

2. How to move the + and the - signs a little closer towards VL? (And I want to colour these signs in red for better emphasization)

   \documentclass[border=1cm]{standalone} 
   \usepackage{amsmath}
   \usepackage{siunitx}
   \usepackage{circuitikz}
   \begin{document}
   \begin{circuitikz}[american voltages]
   \draw (0,0) 
     to [R, l=$R_1$,a=\SI{100}{\ohm},o-] (3,0)
     to [L, l=$L_1$, v=$V_L$,-o] (6,0)
   ;\end{circuitikz}
   \end{document}
   

Answer 1

Bipoles name compass point anchors se (for example) instead of south east, but otherwise behave the same as any TikZ node.

\documentclass[border=1cm]{standalone} 
\usepackage{amsmath}
\usepackage{siunitx}
\usepackage{circuitikz}
\begin{document}
\begin{circuitikz}[american voltages]
\ctikzset{voltage/distance from node=.8}
\draw (0,0) 
  to [R, l=$R_1$,a=\SI{100}{\ohm},o-] (3,0)
  to [L, -o, name=L1] (6,0);
\node[above, xshift=2pt, yshift=2pt] at (L1.n) {$L_1$};
\node[below] at (L1.s) {$V_L$};
\node[red,below] at (L1.w) {\scriptsize$+$};
\node[red,below] at (L1.e) {$-$};
\end{circuitikz}
\end{document}