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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 heater transfers 5010 J at 12 V. What charge flowed (C)?
Which expression gives power loss in a transmission cable of resistance R carrying current I?
Pumped hydro stores 490 kJ per 100 kg at 500 m height (g = 9.8). What is the approximate gravitational potential energy per kg (J/kg)?
A household uses 696 MW supplied to 580 000 homes. What is the mean power per home?
Which equation links energy (E), power (P) and time (t)?
If a heater transfers 26 000 J to 2.0 kg of material and raises its temperature by 5 °C, what is the specific heat capacity (J/kg °C)?
A storage system heats water and stores 33 600 kJ per 100 kg when temperature is increased 80 °C. What is the specific heat capacity implied (J/kg °C)?
Which action would improve household energy efficiency most?
A kett le stores thermal energy for later use. Which quality makes it suitable as energy storage?
A pumped hydro scheme stores energy by raising water to height. Which energy store increases?
An LED has total input power 4.0 W and efficiency 0.85. What is the useful power output?