Extra exam question E6B03
Subelement E6, CIRCUIT COMPONENTS· Group E6B
What property of an LED's semiconductor material determines its forward voltage drop?
- A.Intrinsic resistance
- B.Band gap (correct answer)
- C.Junction capacitance
- D.Junction depth
WhyAn LED's forward voltage drop is determined by its semiconductor material's band gap. An LED's forward voltage drop is set by its semiconductor material's band gap, the energy difference that also determines the wavelength, and therefore the color, of light the LED emits, answer B. Intrinsic resistance, junction capacitance, and junction depth are all real semiconductor properties, but they aren't what sets an LED's characteristic forward voltage.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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