Reducing unwanted energy transfers (Edexcel GCSE Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
What percentage of efficiency can no device achieve?
What percentage of efficiency can no device achieve?
100%
What happens when we reduce the amount of wasted energy in a device?
What happens when we reduce the amount of wasted energy in a device?
Efficiency increases
What are the two main ways to reduce unwanted energy transfers?
What are the two main ways to reduce unwanted energy transfers?
Lubrication and insulation
What does lubrication reduce between moving parts in a machine?
What does lubrication reduce between moving parts in a machine?
Friction
Where does friction cause energy to be transferred to?
Where does friction cause energy to be transferred 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
What does thermal insulation reduce the rate of?
What does thermal insulation reduce the rate of?
Heat energy transfer
What is the process called when particles vibrate and collide to transfer energy?
What is the process called when particles vibrate and collide to transfer energy?
Conduction
What type of thermal conductivity should good insulation materials have?
What type of thermal conductivity should good insulation materials have?
Low thermal conductivity