Electric current

Simple model for electric current in metals.

Also have a look at the Thompson and Rutherford model of the atom, and the Bohr model of the atom.

Edit and compile if you like:

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% Author: Izaak Neutelings (July 2018)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath}
\usepackage{physics}
\usepackage{bm}
\usepackage{tikz}
\tikzset{>=latex} % for LaTeX arrow head
\usetikzlibrary{decorations.markings}
\usepackage{xcolor}
\colorlet{Ecol}{orange!90!black}
%\colorlet{charge+}{blue!80!white}
\tikzstyle{charge0}=[top color=green!80!black!50,bottom color=green!80!black,shading angle=20]
\tikzstyle{charge+}=[top color=red!50,bottom color=red!70!black,shading angle=20]
\tikzstyle{charge-}=[top color=blue!50,bottom color=blue!80,shading angle=20]
\tikzstyle{metal}=[top color=black!15,bottom color=black!25,middle color=black!5,shading angle=10]
\tikzset{
  EField/.style={thick,Ecol,decoration={markings,
                 mark=at position #1 with {\arrow{latex}}},
                 postaction={decorate}},
  EField/.default=0.5}
\begin{document}
% CONDUCTION MODEL
\def\R{0.21} % ion radius
\def\a{0.90} % scale
\def\Rx{0.2*\a*\Ny}
\def\Ry{0.5*\a*\Ny}
\def\Nx{6} % number of ions columns
\def\Ny{3} % number of ions rows
\def\L{\a*(\Nx-1)} % length
\def\electron#1#2#3{
  \node[charge-,draw=black,circle,fill,inner sep=0.8,scale=0.5,line width=0.3]
    (e) at (#1*\a,#2*\a) {$\bm-$};
  \draw[->,green!60!black] (e) --++ (#3*0.7*\a);
}
\begin{tikzpicture}
  
 
 
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