An 11.0-W energy-efficient fluorescent lightbulb is designed to produce the same illumination as a conventional 40.0-W incandescent lightbulb. Assuming a cost of $0.116/kWh for energy from the electric company, how much money does the user of the energy-efficient bulb save during 200 h of use? (Give your answer to the nearest cent.)
An 11.0-W energy-efficient fluorescent lightbulb is designed to produce the same illumination as a conventional 40.0-W incandescent lightbulb. Assuming a cost of $0.116/kWh for energy from the electric company, how much money does the user of the energy-efficient bulb save during 200 h of use? (Give your answer to the nearest cent.)
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Transcribed Image Text:An 11.0-W energy-efficient fluorescent lightbulb is designed to produce the
same illumination as a conventional 40.0-W incandescent lightbulb.
Assuming a cost of $0.116/kWh for energy from the electric company, how
much money does the user of the energy-efficient bulb save during 200 h of
use? (Give your answer to the nearest cent.)
Expert Solution
Step 1
Any component in an electrical circuit dissipates energy in the form of heat, light, sound, etc. For a lightbulb, it is desirable that the entire energy be converted to light energy. But, this is not the case as a part of the energy is lost as heat.
The rate of dissipation of energy. If the energy dissipated in time t is E, then the power P is defined as,
Efficiency is defined as the fraction or percentage of the total power that is converted into light energy.
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