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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

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 device has 34.2 GJ total energy input and efficiency 0.992. What is its useful energy output (GJ)?
A device converts 200 J input into 150 J useful output. What is the efficiency?
If a system has 25% wasted energy, what is its efficiency?
Which expression gives power loss in a transmission cable of resistance R carrying current I?
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)?
An LED has total input power 4.0 W and efficiency 0.85. What is the useful power output?
Two storage methods compared: thermal store with 40% wasted and pumped hydro with 25% wasted. Which method wastes less energy percentage-wise?
A heater transfers 5010 J at 12 V. What charge flowed (C)?
A device wastes 40% of stored energy. If stored energy = 33 600 kJ, how much useful energy remains (kJ)?
Which formula defines efficiency for an energy device?