Efficiency (Edexcel GCSE Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
What does efficiency measure in a device?
What does efficiency measure in a device?
How well input energy converts to useful energy
What is true about a highly efficient device?
What is true about a highly efficient device?
It wastes little energy
A motor receives of energy and transfers usefully. What is its efficiency?
A motor receives of energy and transfers usefully. What is its efficiency?
What unit is used to measure energy in efficiency calculations?
What unit is used to measure energy in efficiency calculations?
Joules (J)
Why can no device be more than 100% efficient?
Why can no device be more than 100% efficient?
Energy cannot be created
Where does wasted energy typically go?
Where does wasted energy typically go?
Dissipates as heat to surroundings
How does lubrication increase efficiency?
How does lubrication increase efficiency?
Reduces friction, preventing heat loss
What can streamlining shapes reduce to improve efficiency?
What can streamlining shapes reduce to improve efficiency?
Air resistance
What equation represents the conservation of energy principle?
What equation represents the conservation of energy principle?
Total Energy = Useful Energy + Wasted Energy
Why is efficiency always less than 100%?
Why is efficiency always less than 100%?
Some energy is always wasted