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Tutor HuntTest QuestionsPhysics QuestionsYear 10 Physics Questions

 

Efficiency (GCSE Physics)

The following is a GCSE Physics test covering 'Efficiency' from the broader topic Energy. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

A household uses 696 MW supplied to 580 000 homes. What is the mean power per home?
A power line transmits 1.60 × 10^9 W with current 2000 A. What is the cable resistance (O)?
A heater transfers 5010 J at 12 V. What charge flowed (C)?
A battery supplies 3.24 × 10^11 J at 230 V. What is the charge transferred (C)?
A kett le stores thermal energy for later use. Which quality makes it suitable as energy storage?
Which action would improve household energy efficiency most?
If a system has 25% wasted energy, what is its efficiency?
An LED has total input power 4.0 W and efficiency 0.85. What is the useful power output?
Which is the best reason to use energy efficient devices in homes?
Which expression gives power loss in a transmission cable of resistance R carrying current I?
Which equation links energy (E), power (P) and time (t)?