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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.Incorrect: 0
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Question 1
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An LED has total input power 4.0 W and efficiency 0.85. What is the useful power output?
Power (P), current (I) and potential difference (V) are related by which equation?
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 battery supplies 3.24 × 10^11 J at 230 V. What is the charge transferred (C)?
Which action would improve household energy efficiency most?
An appliance input is 120 W and useful output 102 W. What is the efficiency (to 2 dp)?
Which change will increase energy conversion efficiency in a machine?
If a system has 25% wasted energy, what is its efficiency?
Which formula defines efficiency for an energy device?
A device has 4.0 W input and 0.85 efficiency. Which is a correct calculation to find useful output?
Which equation links energy (E), power (P) and time (t)?
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