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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 device converts 200 J input into 150 J useful output. What is the efficiency?
A device has 4.0 W input and 0.85 efficiency. Which is a correct calculation to find useful output?
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)?
Power (P), current (I) and potential difference (V) are related by which equation?
If a wind turbine wastes energy through friction, how does oiling moving parts affect efficiency?
Which is the best reason to use energy efficient devices in homes?
A device wastes 40% of stored energy. If stored energy = 33 600 kJ, how much useful energy remains (kJ)?
A pumped hydro scheme stores energy by raising water to height. Which energy store increases?
A household uses 696 MW supplied to 580 000 homes. What is the mean power per home?
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)?
Which formula defines efficiency for an energy device?