Learning module
Radio Waves
Radio uses electromagnetic waves to carry information through space.
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ElectroLab AI teaches theory, low-voltage electronics, and planning concepts. Mains voltage, switchboards, fixed wiring, high-current systems, and legal electrical work must only be performed by licensed electricians where required.
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Mark lessons as complete as you work through the bench checks, then use the quiz to test the ideas.
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Radio Waves
AC vs DC
DC flows one way. AC changes direction repeatedly and is used for power distribution.
Resistors
Resistors limit current, divide voltage, set bias points, and turn electrical energy into heat.
Capacitors
Capacitors store charge, smooth supplies, pass changing signals, and block steady DC.
Inductors
Inductors store energy in magnetic fields and resist changes in current.
Transformers
Transformers transfer AC energy through magnetic coupling and change voltage by turns ratio.
Amplifiers
Amplifiers use a small signal to control a larger signal for audio, sensors, and communication.
Speakers
Speakers use a voice coil in a magnetic field to move air and create sound.
Radio Waves
Radio uses electromagnetic waves to carry information through space.
Solar Basics
Solar panels provide variable DC power that needs regulation before charging batteries.
Visual schematic
Crystal radio signal path
The antenna feeds a tuned LC circuit, then a diode detector extracts audio for the earpiece.
TP1: antenna
TP2: tuned circuit
TP3: detector audio
Interactive lesson workbench
Move the controls and watch the idea change.
This is a simplified teaching model for Radio Waves. Use it to build intuition before opening the calculator, lab, or real bench.
What changed?
1 MHz has a wavelength of about 300.00 m. The 250 uH coil is part of the tuned circuit that chooses which signal gets through.
Guided lesson coach
Work through Radio Waves like a bench exercise.
First, name the job of the part or idea.
Say what it controls, stores, blocks, transfers, or protects. If you can explain that plainly, the formulas become much easier to use.
Start here
Build the crystal radio project and change the coil tap or capacitor position to feel how tuning behaves.
Key ideas
Radio waves are electromagnetic waves that travel through space at nearly the speed of light.
Frequency determines wavelength and strongly affects antenna size and propagation.
An LC circuit can resonate at a chosen frequency, which is the basis of simple tuning.
AM, FM, and digital radio use different methods to put information onto a carrier wave.
Useful formulas
Wavelength = 300,000,000 / frequency
Resonance: f = 1 / (2pi sqrt(LC))
Quarter-wave antenna ~= wavelength / 4
Bench checks
Use the RLC calculator to estimate a tuning circuit.
Keep antenna experiments clear of power lines.
Compare radio reception with short and longer low-voltage-safe antennas.
Common mistakes
Ignoring antenna and ground quality.
Expecting exact tuning from parts with wide tolerance.
Putting outdoor antennas near overhead electrical services.