In this study, the effect of Thunder clouds on the electrical current of the entire atmospheric / ionospheric system and electrical potential was evaluated using orCAD-Pspice software. For this purpose, two types of positive and negative lightning strikes have been investigated and the circuit of atmospheric processes has been prepared. In the case of a negative lightning it was found that when the lightning strike starts, the drainage channel is formed from the end of a thunderstorm to the surface of the earth. The return flow from the surface of the earth to the supercar shows low resistance in front of it, and due to the great potential difference in this region, the current of 30 kΩ is moving from the surface to the cloud side over a period of several tens of microseconds. After that, the continuous flow with a range of 200 amps will be established within a few tens of milliseconds, and then the lightning stops. When negative, the 3.8 volt (0.0013%) ionospheric potential increases from 313 kV. In order to simulate a positive lightning at a range of 5 kilometers, we reverse the power supply. The results show that the high potential of the storm is 5 megawatts, and at the bottom it is 140 megawatts compared to the earth.