What causes a light-emitting diode (LED) to emit light?
Forward current✓الإجابة الصحيحة
Reverse current
Capacitively-coupled RF signal
Inductively-coupled RF signal
الشرح
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.