Which of the following electric apparatus consumes very less electric energy?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → LED
An LED (light emitting diode) gives light directly from a semiconductor, with very little energy lost as heat. For the same amount of light it uses the least electricity of the lamps listed: an LED bulb of about 9 W gives roughly the light of a 15 W CFL, and an LED tube of about 18–20 W replaces a 36–40 W fluorescent tube light.
Why the other options are incorrect
Option (1) CFL — Incorrect. A compact fluorescent lamp saves energy compared with a filament bulb, but uses more than an LED for the same light.
Option (2) Tube Light — Incorrect. A fluorescent tube light uses the most power of these three lamps for the same light.
Option (4) LCD — Incorrect. A liquid crystal display is a screen, not a lamp; it needs a backlight, nowadays made of LEDs.