Practice quiz
Test the basics before the bench.
Short multiple-choice checks for Ohm's Law, safety boundaries, capacitors, inductors, transformers, speakers, PCB terms, and batteries.
Safety first, always.
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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All topics
Mixed bench-ready practice.
22 questions
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Ohm's Law
What current flows through a 220 ohm resistor on a 12 V supply?
Safety
Which work should only be performed by licensed electricians where required?
Capacitors
What does a capacitor resist changing suddenly?
Inductors
Why add a flyback diode across a DC relay coil?
Transformers
A normal transformer works because it has changing magnetic flux. What supply is normally required?
Speakers
Why should a tweeter usually have a crossover or series capacitor?
PCB
What is a PCB footprint?
Solar
Why should lithium batteries use a proper charge controller?
Safety
Which project is best suited to a beginner bench build?
Power
A 12 V lamp draws 2 A. What power does it use?
Transformers
If a transformer has twice as many secondary turns as primary turns, what happens ideally?
Resistors
What does a resistor mainly do in a circuit?
RC Timing
What is the RC time constant formula?
Magnetism
What usually makes an electromagnet stronger?
Amplifiers
Why should speaker impedance match the amplifier rating?
Crossover
In a simple first-order high-pass crossover, what part is often placed in series with a tweeter?
Runtime
A 12 V 10 Ah battery stores about how much ideal energy?
Protection
Where should a fuse go in a battery project?
PCB
What should you check before ordering a PCB?
First Power
What is a smart first power-up method for a new board?
Fault Finding
What is usually the first repair measurement on low-voltage electronics?
Repair