Your goal in each level is to make the bulb glow. To do so you must connect it to the energy source. The connection in not done through the wires, but probably using electromagnetic field through the air. The energy is only transmitted to the round filed around the energy source marked by dashed line. The mobile transmitters you'll find in different places in the level are activated when their field intersects with the field of the energy source or another transmitter. When an activated transmitter's field touches the field of the bulb, the bulb starts to glow. To make the bulb glow for a moment is still not enough. It must be glowing during the required period of time to pass the level.