Reducing unwanted energy transfers (Edexcel GCSE Physics Combined Science): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Can any device be 100% efficient?
Can any device be 100% efficient?
No, no device is 100% efficient
What happens when wasted energy is reduced in a device?
What happens when wasted energy is reduced in a device?
More input energy goes to useful stores
What are the two main ways to reduce unwanted energy transfers?
What are the two main ways to reduce unwanted energy transfers?
Lubrication and thermal insulation
What does lubrication reduce in machines?
What does lubrication reduce in machines?
Friction between moving parts
Where does friction transfer energy to?
Where does friction transfer energy to?
Thermal energy store
What state of matter are lubricants usually?
What state of matter are lubricants usually?
Liquids
Why is oil used in a car engine?
Why is oil used in a car engine?
To reduce friction between moving parts
What does thermal insulation reduce?
What does thermal insulation reduce?
Rate of heat energy transfer
What is the process called when heated particles collide and transfer energy?
What is the process called when heated particles collide and transfer energy?
Conduction
How does thermal conductivity relate to heat transfer rate?
How does thermal conductivity relate to heat transfer rate?
Lower conductivity = slower transfer