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QUIZQuiz · #21EP.227 · 24 s

Quiz #21: which one is the LED symbol? → B, arrows out

Cover of the lesson: Quiz #21: which one is the LED symbol? → B, arrows outComing to YouTube soon
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// WHAT YOU WILL LEARN

The diode triangle + bar with two little arrows pointing OUT (light leaving); arrows pointing in = a photodiode (light coming in).

// LESSON NOTES

Quick quiz: which one is the LED symbol? 💡 A, B, C or D?

✅ B! The two little arrows point OUT — light leaving the diode.
☀️ Arrows pointing IN = a photodiode: light comes in and makes a tiny current.
➡️ The triangle shows which way the current flows — turn an LED around and it stays dark.
(D, with the bent bar, is a Zener diode.)

Read the voiceover (transcript)
  1. Quick quiz! Which one is the LED symbol?
  2. A, plain. B, arrows out. C, arrows in. D, bent bar.
  3. Three seconds!
  4. B! Arrows pointing out: light leaving the diode.
  5. Arrows pointing in? A photodiode. Light comes in.
  6. The triangle points the current's way.
  7. Next: what does k mean in ten k ohms? Comment below!

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