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Science P1 Topic 6
GCSE edexcel core science physics: energy and the future
|What are the nine forms of energy?
|Elastic potential, gravitational potential, kintetic, nuclear, chemical, light, thermal, sound, electrical
|What is the law of conservation of energy?
|That energy can't be created or destroyed- it can only be transfered and transformed. The input energy always equals the output energy.
|What is wasted energy?
|Wasted energy is the other form of energy that is transferred without it being wanted e.g. heat coming out of a light bulb
|What is energy efficiency?
|The proportion of energy transferred to useful forms
|What is the equation for energy efficiency?
|Efficiency = useful energy transferred by the device / total energy supplied to the device x 100%
|What do sankey diagrams show and how?
|They show energy efficiency of an appliance by showing the total input energy and the useful and wasted output forms. The width of the arrow represent the amount of energy in joules.
|When what is happening will a system stay at a constant temperature?
|When it is radiating the same amount of power as it is absorbing.
|What will happen of we stop producing greenhouse gases?
|The earth will reach its new constant (but higher) temperature, because it will absorb more heat than before ( since greenhouse gases absorb heat), and will radiate more heat aswell.