Practice - Power and Efficiency
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Practice Questions
Test your understanding with targeted questions
What is power in physics?
💡 Hint: Think about the relationship between work and time.
How do you calculate average power?
💡 Hint: Look for formulas involving work and time.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What is the SI unit of power?
💡 Hint: Consider the definition of power.
Efficiency can never exceed 100%.
💡 Hint: Think about energy conservation.
2 more questions available
Challenge Problems
Push your limits with advanced challenges
A generator does 800 J of work in 4 seconds. Calculate the power output and compare it with a generator that does 1200 J of work in 6 seconds.
💡 Hint: Use the formula P = W/Δt to find the power for each generator.
An engine's input energy is 5000 J. It converts 1500 J into useful work. Calculate the efficiency and determine the implications.
💡 Hint: Use the formula η = (E_useful / E_input) × 100%.
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Reference links
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