- LED not glowing → Check polarity (long leg = +).
- Loose connections → Reinsert wires properly.
- No resistor used → LED may burn (optional 220Ω resistor for protection).
- Battery weak → Replace or recharge.
Lesson 1: Where Does the Current Go?
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Lesson 2: Wire Me Right!
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Lesson 3: Know the Color Code
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Lesson 4: Check My Circuit!
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Lesson 5: Series vs. Parallel Showdown
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