year 9 energy resources and efficency Flashcards
(20 cards)
What is the primary source of renewable energy?
Solar energy
True or False: Fossil fuels are considered renewable energy sources.
False
Fill in the blank: The efficiency of a machine is defined as the ratio of useful ______ to total input energy.
output energy
What is the main disadvantage of solar energy?
Intermittency due to weather conditions
Which of the following is a non-renewable energy source? (A) Wind (B) Coal (C) Hydro (D) Biomass
B) Coal
What is the term for energy derived from the heat within the Earth?
Geothermal energy
True or False: Hydropower is a renewable energy source.
True
What does the term ‘energy efficiency’ refer to?
The measure of how much useful energy is obtained from a given amount of energy input
Fill in the blank: Biomass energy is derived from ______ materials.
organic
Which energy resource is considered the cleanest?
Wind energy
What is a major benefit of using nuclear energy?
Low greenhouse gas emissions
Multiple choice: Which of the following is NOT a benefit of renewable energy? (A) Sustainability (B) Low emissions (C) Infinite supply (D) High initial cost
D) High initial cost
What is the main environmental concern associated with fossil fuels?
Greenhouse gas emissions
True or False: Energy conservation and energy efficiency are the same.
False
What is the primary use of geothermal energy?
Heating and electricity generation
Fill in the blank: Wind turbines convert ______ energy into electrical energy.
kinetic
What is the term for the maximum amount of energy that can be extracted from a resource?
Energy yield
Which energy resource can be harnessed from ocean tides?
Tidal energy
True or False: Energy audits are used to assess energy use and identify efficiency improvements.
True
What is the role of energy storage systems in renewable energy?
To store excess energy for later use
