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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 tile generates 4.4 W at 40 V. What is the current through the tile (A)?
Two storage methods compared: thermal store with 40% wasted and pumped hydro with 25% wasted. Which method wastes less energy percentage-wise?
Which is the correct definition of efficiency?
An appliance input is 120 W and useful output 102 W. What is the efficiency (to 2 dp)?
Which is the best reason to use energy efficient devices in homes?
A device has 4.0 W input and 0.85 efficiency. Which is a correct calculation to find useful output?
A pumped hydro scheme stores energy by raising water to height. Which energy store increases?
A lamp is 85% efficient and uses 4.0 W. How much power is wasted as heat (W)?
If a system has 25% wasted energy, what is its efficiency?
A power line transmits 1.60 × 10^9 W with current 2000 A. What is the cable resistance (O)?
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)?