Watch electricity
do the work.

Add a part: drag it from the left onto the grid, or click it then click the grid. Drag while placing to set its length.
Wire: drag from any terminal dot to another point. Wires bend once to stay square. Press W to draw wires anywhere.
Connect: things connect only where ends meet. A red ring means a terminal is not connected to anything.
Move: drag a part by its body. Stretch: hold Shift and drag its pink end handles.

Build any circuit and watch it run: real voltages, real currents, real physics. Then climb into the aircraft and see how the radios, transponder, VOR and ILS actually work.