A quiz covering energy efficiency, power calculations, and methods to reduce energy waste. Test your knowledge with this interactive quiz on GCSE Physics…
10 questions • Zestly
• A motor transfers 500 J of electrical energy into 400 J of useful kinetic energy. What is the efficiency of the motor?
• Which of the following methods are effective for reducing unwanted energy transfers in a mechanical system?
• A light bulb consumes 600 J of energy in 10 seconds. What is the power rating of the bulb?
• A kettle transfers 2000 J of energy to water in 5 seconds. If the kettle is 80% efficient, how much energy was supplied to the kettle?
• Which statements correctly describe the concept of energy efficiency?
• A machine does 1200 J of work in 2 minutes. What is the power output of the machine?
• How does thermal insulation help improve the efficiency of a heating system?
• An electric motor has a power rating of 500 W. How much energy does it transfer in 30 seconds?
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