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Circuit Theory
The math and methods behind circuit analysis — from Kirchhoff's laws to network theorems — for anyone moving from "how it works" to "how to calculate it."
7 articles
KCL
Learn Kirchhoff’s Current Law, define nodes and current directions, calculate unknown branch currents, and apply KCL to resistor networks and measurements.
Mesh Analysis
Learn mesh-current analysis step by step, including shared resistors, KVL signs, supermeshes, AC impedance, and result checks.
Superposition
Learn the superposition theorem with source-suppression rules, worked examples, dependent sources, sign conventions, and power limitations.
Thevenin Theorem
Learn how to calculate Thevenin voltage and resistance, build equivalent circuits, analyze loads, and handle dependent sources and AC impedance.
Norton Theorem
Learn Norton equivalents, calculate short-circuit current and equivalent resistance, handle dependent sources, and solve load circuits.
KVL
Learn Kirchhoff’s Voltage Law, choose loop directions and signs, calculate voltage drops, analyze multiple loops, and verify circuits with a multimeter.
Nodal Analysis
Learn nodal analysis step by step: choose a reference node, write KCL equations, solve node voltages, handle current sources, and verify results.