An Energy-Efficient Lightbulb Uses 15 W of Power for an Equivalent

question 10

Multiple Choice

An energy-efficient lightbulb uses 15 W of power for an equivalent light output of a 60 W incandescent lightbulb. How much energy is saved each month by using the energy-efficient lightbulb instead of the incandescent lightbulb for 4 hours a day? Assume that there are 30 days in one month.

• A) 5.4 kW·hr
• B) 1.35 kW·hr
• C) 21.6 kW·hr
• D) 1.8 kW·hr
• E) 7.2 kW·hr

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Definitions:

Offshore Assembly Plants

Factories located in another country than where the finished product is sold, used by companies to reduce production costs.

Low Wages

Earnings that are minimal in comparison to the average or median wage levels within a specific area or industry.

Inexpensive Energy

Energy sources that are affordable in cost, often due to technological advancements, efficiency improvements, or subsidies.

Pharmaceutical Companies

Businesses involved in the research, development, production, and marketing of drugs and medications for medical use.