Practice Efficient Use Of Energy (4.5.3) - Work, Power, and Energy

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8 questions

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2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
2 questions · about 1 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What does energy efficiency mean?
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Think about how we can save energy at home.
Question 2.
Give an example of an energy-efficient appliance.
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Consider what devices you use daily.
3Question 3.
What is the primary goal of energy efficiency?
- To use more energy
- To reduce energy consumption without sacrificing performance
- To increase energy bills
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Think of ways to maintain comfort while reducing energy use.
4Question 4.
True or False: Energy-efficient appliances typically cost more upfront but save money in the long run.
- True
- False
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Consider the long-term savings vs. initial investment.
Question 5.
If an LED light bulb uses 10 watts of power for 5 hours a day, calculate the total energy consumption in kilowatt-hours for one month.
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Remember to convert watts to kilowatts!
Question 6.
A refrigerator rated at 300 kWh/year is replaced with a model rated at 200 kWh/year. Calculate the annual savings in energy consumption.
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Simply find the difference in energy consumption.

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