# Chapter 2 Basic radio theory, circuits and calculations

Molecules, atoms, and electrons

Conductors and insulators

Electrical units

The direct current (DC) circuit

Resistors

The alternating current (AC) circuit

Magnetism

Electromagnetic induction

Inductors used in radio equipment

Capacitors used in radio equipment

The decibel

Tuned circuits

L/C ratio

Resonance curves and selectivity

Coupled circuits

Transformers

Filters

Mixing

Tolerance, and effect of temperature on components

Preferred values

Quartz crystals

Screening

Calculations

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