The cost of a kilowatt hour of energy in the bill is 0.20 euros. A cylindrical led bulb of 5 W has a luminous flux of 50 lm. What is the luminous efficiency of this light source? Knowing that the bulb is 5cm long, 36mm in diameter, and plugged into a 220V socket, what is the resistivity of the bulb? How much would you spend in a year if you used 5 LED bulbs all on for 12 hours a day?
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The cost of a kilowatt hour of energy in the bill is 0.20 euros. A cylindrical led bulb of 5 W has a...
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