•
Battery stores chemical energy. [1]
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The motor convert electrical energy into kinetic energy. [1]
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Some energy is wasted as sound (Not heat). [1]
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Work out the sankey diagram efficiency: 37.5% [2]
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6 Mark question: Talk about each type of energy saving, what they do and their payback time. [6]
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What is a U value? Measurement of how effective a material is as an insulator. [1]
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What will happen to the U value with more insulation? Decreases [1]
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Why can’t it be a bar graph? Because the data is continuous. [1]
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8 / 10 = 0.8 (10%) so 8 - 7.2 = 0.8 meaning it is 10% [3]
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The temperature outside must be constant so not to change the results and affect the outcome. [2]
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10% Won’t always be correct as people will have different rates of energy transfer. [2]
•
Circle the resolution: 0.5 [1]
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20.5°C [1]
•
Type of wave? Microwaves [1]
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Draw the normal [1]
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Properties of waves in the electromagnetic spectrum: [2]
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Draw the reflection [2]
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Wave which gives of most heat? Infra red [1]
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Why isn't the solar power always working to full efficiency? Sun ain’t always shining. So electricity won’t be generated. [2]
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[Renewable vs Nonrenewable question] All the renewable energy sources depend on the weather being appropriate for them to produce energy whereas the non-renewable energy sources do not and as a result the renewable energy sources have a lower capacity factor because of the intermittent nature of the weather such that the conditions are not necessarily conducive to the production of electricity when, for example, there is no wind. [3]
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The Specific heat capacity must be high in order to retain the thermal energy and so that more thermal energy can be stored. [1]
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16 hours [3]
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What is the effect on the ball? Doppler effect. [1]
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Wave comparison: Wavelength decreases / same speed / frequency increases [3]
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Specific heat capacity: 4200 J/kg°C [4]
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[Conduction question] The can-chiller cools the surroundings of the can. This causes a temperature gradient between the inside of the can and the outside. The result of this temperature gradient is that thermal energy moves out of the can by conduction. The electrons in the metal diffuse through the metal and collide with other electrons to transfer the kinetic energy and the particles vibrate with a similar intention, causing the thermal energy to be transferred from the inside of the can to the outside, thus cooling it down. [4]
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Convection? Heats up, less dense, rises, cools down, more dense, falls back down. [3]
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