1, KCL and KVL. These are the two most important basic laws. The former is the embodiment of material immortality in universities, while the latter is the embodiment of energy conservation in electricity. Various circuit parameters can be solved systematically.
2. Power conversion. Through the mutual conversion between voltage source and current source, the circuit is simplified and some slightly complicated circuits are solved.
3. The principle of superposition. Can solve the voltage and current parameters of a multi-power linear circuit (not used for power superposition).
4. Thevenin and Norton Theorem, which mainly solve the circuit with single-port parameter change in complex circuits.
5. The concepts of amplitude, frequency and initial phase of sinusoidal alternating current, phasor diagram and phasor operation.
6. The concepts of inductive reactance, capacitive reactance and impedance.
7. Active power, reactive power, apparent power and power factor of alternating current.
8. Three-element method of first-level transition process.
The concepts of three-phase alternating current, line voltage, line current, star-delta load connection and three-phase electric energy.