Learning module
Solar Basics
Solar panels provide variable DC power that needs regulation before charging batteries.
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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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Solar Basics
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.
Start here
Estimate a small battery pack runtime for a 5 W USB load, then compare the result with different efficiency values.
Key ideas
A solar panel's voltage and current depend on sunlight, temperature, and the connected load.
Battery charging must match the battery chemistry and use proper charge control.
A boost or buck converter changes voltage, but it cannot create extra power.
Fuses, wire size, polarity protection, and enclosure choices matter even at low voltage when current is high.
Useful formulas
Power = V x I
Runtime hours = Ah x V x efficiency / load W
Charging current estimate = panel watts / battery voltage
Bench checks
Measure panel open-circuit voltage before connecting a charger.
Confirm charger module input, battery, and output polarity.
Test USB output with a dummy load before plugging in a phone.
Common mistakes
Connecting a solar panel straight to a lithium battery.
Forgetting that a 12 V battery can deliver very high fault current.
Using thin wires or no fuse on battery outputs.