Circuit theory uses mathematical models to predict voltage, current, power and dynamic behaviour in electrical networks. The articles on this page cover Kirchhoff’s laws, node and loop methods, superposition, Thévenin and Norton equivalents, two-port models, operational amplifiers and first- and second-order circuits.
Start with circuit variables and network laws, then move to equivalent-circuit theorems and systematic analysis. The later sections cover matrices, RL and RLC transients, frequency response, two-port networks and op-amp models. Each model has assumptions, so compare calculated results with component limits and measured behaviour when applying it to a physical circuit.
