Physics

Physics, 17.07.2019 01:00, genyjoannerubiera

An incandescent bulb produces 520 lumens and has an efficacy of 13 lm/w. what is the power of the bulb? 2.5 w 40 w 503 w 533 w

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Physics, 25.07.2019 21:00, ally6977

A4.0 w led bulb produces 240 lumens. what is the efficacy of the bulb? 1. 1.7 lm/w 2. 60 lm/w 3. 236 lm/w 4. 244 lm/w

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Chemistry, 07.10.2019 23:20, kingjustin0825

18-30. greenhouse gas reduction. an 18-w compact fluorescent bulb produces approximately the same amount of light as a 75-w incandescent bulb that screws into the same socket. the fluorescent bulb lasts 10 000 h and the incandescent bulb lasts 750 h. over the lifetime of the fluorescent bulb, the electricity savings is (75 18 w) (104 h) 570 kw h. one kilogram of coal produces 2 kw h of electricity. if coal contains 60 wt% carbon, how many more kilograms of co2 are produced by running the incandescent bulb rather than the fluorescent bulb? if the coal contains 2 wt% sulfur, how many more kilograms of so2 are produced?

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Business, 15.10.2019 18:30, aliciatorrescollins

Compact fluorescent bulbs. compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. they initially cost much more, but they last far longer and use much less electricity. according to one study of these bulbs, a compact bulb that produces as much light as a 100 w incandescent bulb uses only 23 w of power. the compact bulb lasts 10,000 hours, on the average, and costs $11.00, whereas the incandescent bulb costs only $0.75, but lasts just 750 hours. the study assumed that electricity costs $0.080 per kilowatt-hour and that the bulbs are on for 4.0 h per day. (a) what is the total cost (including the price of the bulbs) to run each bulb for 3.0 years? (b) how much do you save over 3.0 years if you use a compact fluorescent bulb instead of an incandescent bulb? (c) what is the resistance of a "100 w" fluorescent bulb? (remember, it actually uses only 23 w of power and operates across 120 v.)

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Engineering, 15.10.2019 23:10, alexabessin

Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. they initially cost much more, but they last far longer and use much less electricity. according to one study of these bulbs, a compact bulb that produces as much light as a 100 w incandescent bulb uses only 23 w of power. the compact bulb lasts 10,000 hours, on the average, and costs $11.00, whereas the incandescent bulb costs only $0.75, but lasts just 750 hours. the study assumed that electricity costs $0.080 per kilowatt-hour and that the bulbs are on for 4.0 h per day. (a) what is the total cost (including the price of the bulbs) to run each bulb for 3.0 years? (b) how much do you save over 3.0 years if you use a compact fluorescent bulb instead of an incandescent bulb? (c) what is the resistance of a "100 w" fluorescent bulb? (remember, it actually uses only 23 w of power and operates across 120 v.)

Answers: 3

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