QuestenaUn entraînement qui indique quoi revoir ensuite
RechercheCréer un test
Question 231

What causes a light-emitting diode (LED) to emit light?

  1. Forward currentBonne réponse
  2. Reverse current
  3. Capacitively-coupled RF signal
  4. Inductively-coupled RF signal

Explication

An LED emits light when it is forward biased and forward current passes through the junction, releasing energy as photons. Under reverse bias it does not conduct at all, so no light is produced.

Continuer avec ce test

Commencer l’entraînement
Comprendre ce thème (≈6 min)Retour au test
Question 231: What causes a light-emitting diode (LED) to emit light? · FCC Technician Class (Element 2) · Questena