Statement 1 is correct: A CFL (Compact Fluorescent Lamp) produces light by passing an electric current through mercury vapour, which excites phosphor coating inside the tube. An LED (Light Emitting Diode) lamp uses semiconductor material (diodes) that emit light when electric current passes through them. Statement 2 is incorrect: LED lamps typically have a significantly longer average lifespan (e.g., 25,000 - 50,000+ hours) compared to CFLs (e.g., 8,000 - 15,000 hours). Statement 3 is correct: LED lamps are generally more energy-efficient than CFLs, meaning they use less electricity to produce the same amount of light (lumens).
What is the difference between a CFL and an LED lamp ? Consider the following statements: To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material. The average life span of a CFL is much longer than that of an LED lamp. A CFL is less energy-efficient as compared to an LED lamp. Which of the statements given above is/are correct ?
Asked in PPSC CS Prelims 2018 · Topic: Electric Current (Electrical Power and Energy, Joule heating effect)
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