What makes an LED glow brighter or dimmer as applied voltage changes? How is this used in adjustable display brightness?
لگائے گئے وولٹیج سے LED کی روشنی کم یا زیادہ کیوں ہوتی ہے؟ ڈسپلے کی روشنی ایڈجسٹ کرنے میں یہ خاصیت کیسے استعمال ہوتی ہے؟
Solution & explanation
Brightness mainly follows forward current, which changes steeply with voltage. A resistor or current driver limits it; displays often vary regulated current or use pulse-width modulation. Applying arbitrary voltage directly is not a controlled brightness method.
Independent study answer. Original textbook ↗ · English-medium printed page 165.