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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 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)?
A pumped hydro scheme stores energy by raising water to height. Which energy store increases?
Which formula defines efficiency for an energy device?
Two storage methods compared: thermal store with 40% wasted and pumped hydro with 25% wasted. Which method wastes less energy percentage-wise?
A device has 34.2 GJ total energy input and efficiency 0.992. What is its useful energy output (GJ)?
A household uses 696 MW supplied to 580 000 homes. What is the mean power per home?
A battery supplies 3.24 × 10^11 J at 230 V. What is the charge transferred (C)?
Which change will increase energy conversion efficiency in a machine?
An energy store increases when a spring is stretched. Which store is it?
An appliance input is 120 W and useful output 102 W. What is the efficiency (to 2 dp)?
If a power station operates at 92% of the year, how many days does it run? (365 days year)