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3 cards from this section. Quick, good the night before a test.
What does energy efficiency mean?
Think about how to reduce energy bills.
Why is it essential to know the power rating of an appliance?
Think about comparing devices.
What is the primary benefit of energy-efficient devices?
Think about what efficient means.
True or False: A higher wattage rating means an appliance is more energy-efficient.
Ask yourself the difference between wattage and efficiency.
You have three appliances: one uses 1000W, another 700W, and the last 400W. If you run them all for 5 hours a day, calculate the total energy consumed in kWh for a month.
Add the wattages, multiply by hours and days, and convert to kWh.
Your energy bill is $45 for 300 kWh consumed. If you switch to energy-efficient devices and reduce usage by 20%, how much will your new bill be?
Calculate the reduced consumption first, then find the new cost.
6 more questions in this section. Enroll free to practise them all.
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