Electric Circuits and Networks

2.7 SUMMARY

• Lumped parameter circuit theory assumes that a circuit element can be described by a terminal voltage variable and an element current variable. Unique terminal voltage for an element can be defined only if the induced electric field outside the devices can be neglected and the connecting wires have negligible resistance. Unique element current for an element can be defined only if the connecting wires are so thin that the surface charge distribution on their surface can be ignored.
• Let a circuit contain b-elements, l-loops and n-nodes, and let it have a unique solution. Then, the ‘circuit analysis problem’ involves solving for 2b variables –one voltage variable and one current variable per two-terminal element. b equations are obtained ...