- Wrong LED polarity → LEDs don’t glow. (Check long leg = positive, short leg = negative).
- No resistor used → LED may burn out.
- Loose breadboard connections → LEDs flicker or don’t work.
- Battery too weak → Series LEDs may not glow at all.
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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