Cfrgtkky

Could you help me with drawing of the transformer (see below)? I haven't enough experience with tikz to achieve this alone.

In addition to @user177954's nice answer using straight lines, you can also achieve it using decorations options available in the TikZ library.

 documentclass{standalone}

 usepackage{tikz}

 usetikzlibrary{calc,patterns,

             decorations.pathmorphing,

             decorations.markings}



 begin{document}

 begin{tikzpicture}

 draw[help lines, step=1] (-2,-1)grid(2,2);

 tikzstyle{spring}=[thick,decorate,decoration={zigzag,pre length=0cm,post

 length=0cm,segment length=8}]

% the line

path (-2,1) node (p1) {};

path (2,1) node (p2) {};

draw[very thick] (p1) to  (p2);

%the triangles

draw (-1.86,0.975) 

-- (-1.96,0.875)-- (-1.76,0.875) 

-- cycle;

draw (1.86,0.975) 

-- (1.96,0.875)-- (1.76,0.875) 

-- cycle;

 draw[spring] ($(p1.east)-(-0.3,0)$) -- ( $(p1.east)-(-0.3,1)$);

  draw[spring] ($(p2.west)-(0.3,0)$) -- ( $(p2.west)-(0.3,1)$);

  % ground

  draw[very thick] ($(p1.east)-(0,1)$) to ($(p1.east)-(-0.6,1)$);

 fill [pattern = north east lines] ($(p1.east)-(0,1)$) rectangle ($(p1.east)-(-0.6,1.3)$);

 draw[very thick] ($(p2.west)-(0,1)$) to ($(p2.west)-(0.6,1)$);

 fill [pattern = north east lines] ($(p2.west)-(0,1)$) rectangle ($(p2.west)-(0.6,1.3)$);

 end{tikzpicture}

 end{document}

which would give you:

For easy reference, you can also use grid lines in the environment for assitive plotting and referencing your nodes. As you get a hold of it, you can always skip (which unfortunately, I don't ;)).

Really just for fun (because I wanted to try out how much one can abuse /.list.)

documentclass[tikz,border=3.14mm]{standalone}

usetikzlibrary{shapes.geometric,patterns}

begin{document}

begin{tikzpicture}[trian/.style={anchor=north,regular polygon,regular polygon

sides=3},zig/.style={insert path={-- ++(-#1,-#1) -- ++(#1,0)}}]

draw[very thick] (0,0) node[trian,thin,draw,anchor=north]{} -- (9,0)

node[trian,thin,draw,anchor=north]{};

draw[thick] (3,0) [zig/.list={0.5,0.5,0.5,0.5}] node[below,pattern=north east

lines,minimum width=0.5cm,minimum height=0.3cm,xshift=-0.25cm]{};

draw[thick] (6,0) [zig/.list={0.5,0.5,0.5,0.5}] node[below,pattern=north east

lines,minimum width=0.5cm,minimum height=0.3cm,xshift=-0.25cm]{};

end{tikzpicture}

end{document}

Simple straight lines, don't require any experience in tikz:

documentclass{article}

usepackage{tikz}



begin{document}



begin{tikzpicture}

draw (0.9840,6.7461) -- (0.7801,6.4168) -- (1.2036,6.4168) -- (0.9840,6.7461);

draw (2.7719,6.7461) -- (2.4426,6.2756) -- (2.7876,6.2700) -- (2.4426,5.8992) -- (2.7876,5.8992) -- (2.4426,5.5709) -- (2.7876,5.5698) -- (2.4426,5.2405) -- (2.7876,5.2405);

draw (2.4426,5.2405) -- (2.3245,5.0793);

draw (2.5609,5.2405) -- (2.4428,5.0793);

draw (2.6792,5.2405) -- (2.5611,5.0793);

draw (2.7975,5.2405) -- (2.6794,5.0793);

draw (6.1885,6.7461) -- (6.3924,6.4168) -- (5.9690,6.4168) -- (6.1885,6.7461);

draw(4.5091,6.7461) -- (4.1798,6.2756) -- (4.5248,6.2700) -- (4.1798,5.8992) -- (4.5248,5.8992) -- (4.1798,5.5709) -- (4.5248,5.5698) -- (4.1798,5.2405) -- (4.5248,5.2405);

draw (4.1798,5.2405) -- (4.0617,5.0793);

draw (4.2981,5.2405) -- (4.1800,5.0793);

draw (4.4164,5.2405) -- (4.2983,5.0793);

draw (4.5347,5.2405) -- (4.4166,5.0793);

draw (0.9840,6.7461) -- (6.1885,6.7461);

end{tikzpicture}

end{document}