Conservation & Dissipation of Energy (OCR GCSE Physics A, Combined (Gateway Science Suite)): Quizzes
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12 questions from this quiz
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Practise the questions
12 questions from this quiz
What does the law of conservation of energy state?
What does the law of conservation of energy state?
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?
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 or dissipated energy
In a light bulb, which energy output is considered wasted?
In a light bulb, which energy output is considered wasted?
Heat
How do useful and wasted energy relate to energy input?
How do useful and wasted energy relate to energy input?
They always add up to energy input
What are two key methods for minimising wasted energy?
What are two key methods for minimising wasted energy?
Thermal 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 tell you about a material?
What does thermal conductivity tell you about a material?
How well it transfers heat energy
What type of material makes a good thermal insulator?
What type of material makes a good thermal insulator?
Low thermal conductivity
Why does metal have high thermal conductivity?
Why does metal have high thermal conductivity?
Heat transfers quickly through it