If a 100-watt incandescent light bulb puts out 95-watts of heat, what is the efficiency of...
If a 100-watt incandescent light bulb puts out
95-watts of heat, what is the efficiency of the bulb?
(this is approximately how efficient incandescent
light bulbs are!)
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If a 100-watt incandescent light bulb puts out
95-watts of heat, what is the efficiency of...
Which has a greater resistance: 75 watt bulb or a 100 watt bulb?
Which has greater resistance: a 75 watt bulb or a 100 watt bulb?Suppose you connect a 75 watt bulb across only 50 volts: will you still get 75 watts of power?Suppose you connect a 100 watt bulb and a 75 watt bulb in series and then connect the combination to a regular 110 volt line. Which bulb (if either) will burn brighter?(note that we are talking about the older incandescent bulbs here... the newer types are quite different.)
Two light bulbs of 60 watts and 100 watts are wired in parallel. What light bulb...
Two light bulbs of 60 watts and 100 watts are wired in parallel. What light bulb has greater resistance?
6. An incandescent light bulb operates at 100 Watts. Let's assume all the power is emitted...
6. An incandescent light bulb operates at 100 Watts. Let's assume all the power is emitted as light (most of which will be infrared). The output peaks at a wavelength Amax 1317 nm. a. What is the temperature of the filament? b. What is the total surface area of the filament? (You can assume ε-1.)
An engineer builds a 1 square meter dish to collect light from a distant 100 [Watt]...
An engineer builds a 1 square meter dish to collect light from a distant 100 [Watt] incandescent light bulb. Assume that the entire 100 Watts of electrical power that the bulb consumes is radiated as light. If the bulb radiates uniformly in all directions and is 1 kilometer away from the engineer's collection dish, approximately how much energy will the dish will collect every second? Assume no other light is present to contaminate the signal and assume the dish is...
how much heat is produced by stationary incandescent 100.W electric light bulb that has a constant...
how much heat is produced by stationary incandescent 100.W electric light bulb that has a constant internal energy after it has been eliminated for 1.00 h?
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They...
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but 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 23.0 W of power. The compact bulb lasts 1.00×104 hours, on the average, and costs $ 11.0 , whereas the incandescent bulb costs only 76.0 ¢, but lasts...
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They...
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but 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 23.0 W of power. The compact bulb lasts 1.00×104 hours, on the average, and costs $ 12.0 , whereas the incandescent bulb costs only 75.0 ¢, but lasts...
Denver, CO replaced 13,000 traffic lights, each with three 150 watt incandescent bulbs, with traffic lights...
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A 60W incandescent light bulb costs $0.25 and lasts 1 year. A compact fluorescent light (CFL)...
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Light emitting diodes (LED) light bulbs have become required in recent years, but do they make...
Light emitting diodes (LED) light bulbs have become required in recent years, but do they make financial sense? Suppose a typical 60-watt incandescent light bulb costs $.43 and lasts 1,000 hours. A 15-watt LED, which provides the same light, costs $3.30 and lasts for 12,000 hours. A kilowatt-hour of electricity costs $.119. A kilowatt-hour is 1,000 watts for 1 hour. If you require a return of 10 percent and use a light fixture 500 hours per year, what is the...
Two light bulbs of 60 watts and 100 watts are wired in parallel. What light bulb has greater resistance?
6. An incandescent light bulb operates at 100 Watts. Let's assume all the power is emitted as light (most of which will be infrared). The output peaks at a wavelength Amax 1317 nm. a. What is the temperature of the filament? b. What is the total surface area of the filament? (You can assume ε-1.)
An engineer builds a 1 square meter dish to collect light from a distant 100 [Watt] incandescent light bulb. Assume that the entire 100 Watts of electrical power that the bulb consumes is radiated as light. If the bulb radiates uniformly in all directions and is 1 kilometer away from the engineer's collection dish, approximately how much energy will the dish will collect every second? Assume no other light is present to contaminate the signal and assume the dish is...
Light emitting diodes (LED) light bulbs have become required in recent years, but do they make financial sense? Suppose a typical 60-watt incandescent light bulb costs $.43 and lasts 1,000 hours. A 15-watt LED, which provides the same light, costs $3.30 and lasts for 12,000 hours. A kilowatt-hour of electricity costs $.119. A kilowatt-hour is 1,000 watts for 1 hour. If you require a return of 10 percent and use a light fixture 500 hours per year, what is the...
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