"The most exciting phrase to hear in science, the one that heralds new discoveries, is not "Eureka" (I found it!) but "That's funny ..."
- Isaac Asimov
What is inside a power adapter? Converting AC current into DC one. Diode. Using transformers and rectifiers.
Capacitors in AC circuits. Reactance of a capacitor.
Inductors in AC circuits. Inductive reactance.
LC circuits. Electric oscillations in LC circuit. Transformation of energy in LC circuits.
Frequency of electric oscillations.
Inductance as electric inertia. Analogy between mechanical potential and kinetic energies and electric energies stored in electric and magnetic fields.
RLC circuit. Electric resonance in AC circuits.