Energy Efficiency
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is energy efficiency?
Back
Energy efficiency is the measure of how much useful energy is produced from a given amount of energy input, expressed as a percentage.
2.
FLASHCARD QUESTION
Front
What is a fossil fuel?
Back
Fossil fuels are natural substances formed from the remains of ancient plants and animals, which can be burned for energy. Examples include coal, oil, and natural gas.
3.
FLASHCARD QUESTION
Front
What is solar energy?
Back
Solar energy is energy harnessed from the sun's rays, which can be converted into electricity using solar panels.
4.
FLASHCARD QUESTION
Front
What is the energy efficiency of hydroelectric dams?
Back
The energy efficiency of hydroelectric dams is approximately 90%.
5.
FLASHCARD QUESTION
Front
What happens to energy during transformations?
Back
Energy can be lost as heat during transformations, which reduces the overall efficiency of the process.
6.
FLASHCARD QUESTION
Front
What is the formula for calculating efficiency?
Back
Efficiency = (Useful Energy Output / Total Energy Input) x 100%.
7.
FLASHCARD QUESTION
Front
What is the role of wind energy in energy efficiency?
Back
Wind energy is a renewable energy source that can be harnessed to generate electricity, contributing to energy efficiency by reducing reliance on fossil fuels.
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