GCSE Physics double award notes

1. Energy GCSE Physics

4. 33 % Longer

10. Energy Transfer Input energy Kinetic Output (useful) energy- electrical/light The Dynamo Output (wasted) energy- heat/sound

17. Input energy Chemical 1 000 000 kJ Output (useful) energy- Electrical 400 000 kJ Output (wasted) energy- Heat/Sound 600 000 kJ Transforms to Kinetic The input energy has changed form to kinetic and then to both useful electrical energy and wasted energy. The input energy and output energy totals are equal as energy is conserved.

20. … the Primary Source The Sun Nuclear Energy

27. Geothermal Energy The rocks not too far below the surface are quite hot, 500°C about 1 km down.

30. Geothermal Energy - Deep drilling is very difficult - Drilling can also be expensive Disadvantages - Renewable energy resource - Huge quantities of energy available Advantages

31. Biomass harvesting switchgrass

37. Efficiency is a measure of how good a device is at changing energy from one form to another. All devices waste energy, so the efficiency of a device is never 100%. There is a formula that allows you to calculate the efficiency of a device or of a process. Energy efficient light bulbs are more efficient than normal light bulbs because they w____ less energy, and more of the e______ energy that they are supplied with is converted into l___ energy and not h___. aste lectrical ight eat