Conservation & Dissipation of Energy (AQA GCSE Physics Combined Science): Quizzes
📚Quizzes
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12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the fundamental principle of energy conservation?
What is the fundamental principle of energy conservation?
Energy cannot be created or destroyed
In a closed system, what is the net change in energy?
In a closed system, what is the net change in energy?
Always zero
What is useful energy?
What is useful energy?
Energy transferred to the desired store
What term describes energy that ends up in unintended stores?
What term describes energy that ends up in unintended stores?
Wasted energy
In a light bulb, which energy output is considered useful?
In a light bulb, which energy output is considered useful?
Light energy
What do useful and wasted energy always add up to?
What do useful and wasted energy always add up to?
Energy input
What are two key methods for minimising wasted energy?
What are two key methods for minimising wasted energy?
Insulation and lubrication
What is the purpose of thermal insulation?
What is the purpose of thermal insulation?
To slow down the rate of heat loss
How does lubrication reduce energy loss?
How does lubrication reduce energy loss?
By making surfaces smoother
What does thermal conductivity measure?
What does thermal conductivity measure?
How well a material transfers heat
Materials with low thermal conductivity make what type of insulators?
Materials with low thermal conductivity make what type of insulators?
Good thermal insulators
Why do buildings use materials with low thermal conductivity?
Why do buildings use materials with low thermal conductivity?
To insulate rooms inside