Electric Circuits and Networks

1.9 SUMMARY

• Electric Circuit is a mathematical model of a real physical electrical system. It is an approximation of Electromagnetic Field Theory.
• Electromagnetic disturbances travel with a finite speed in electrical systems. Electric circuit theory assumes that the largest dimension in the circuit is so small that electromagnetic disturbances take negligible time to cover that distance compared to the time interval required for source quantities in the circuit to change significantly.
• In addition, lumped parameter circuit theory assumes the following:
  1. The electrostatic field created by charge distribution on an electrical device is confined to space within the device and in the immediate vicinity of the device predominantly. Thus, the terminal ...